البحث عن طبيب

P. Pearse P. Morris, M.B., B.Ch.

  1. Psychiatrist
  2. Radiologist
طلب موعد

المنشورات

  1. Betting T, Benson JC, Madhavan A, Shlapak D, Morris P, Morris J, Diehn F, Verdoorn J, Liebo G, Carr C. Safety and histopathologic yield of percutaneous CT-guided biopsies of the skull base, orbit, and calvarium. Neuroradiology. 2024 Mar; 66 (3):417-425 Epub 2024 Jan 10
    View PubMed
  2. Elsbernd P, Cacciaguerra L, Krecke KN, Chen JJ, Gritsch D, Lopez-Chiriboga AS, Sechi E, Redenbaugh V, Morris PP, Carter JL, Wingerchuk DM, Tillema JM, Valencia-Sanchez C, Thakolwiboon S, Pittock SJ, Flanagan EP. Cerebral enhancement in MOG antibody-associated disease. J Neurol Neurosurg Psychiatry. 2023 Dec 14; 95 (1):14-18
    View PubMed
  3. Madhavan AA, Cutsforth-Gregory JK, Brinjikji W, Bathla G, Benson JC, Diehn FE, Eckel LJ, Mark IT, Morris PP, Payne MA, Verdoorn JT, Weber NM, Yu L, Baffour F, Fletcher JG, McCollough CH. Diagnostic Performance of Decubitus Photon-Counting Detector CT Myelography for the Detection of CSF-Venous Fistulas. AJNR Am J Neuroradiol. 2023 Dec 11; 44 (12):1445-1450
    View PubMed
  4. Brinjikji W, Madhavan A, Garza I, Whealy M, Kissoon N, Mark I, Morris PP, Verdoorn J, Benson J, Atkinson JLD, Kobeissi H, Cutsforth-Gregory JK. Clinical and imaging outcomes of 100 patients with cerebrospinal fluid-venous fistulas treated by transvenous embolization. J Neurointerv Surg. 2023 Oct 28 [Epub ahead of print]
    View PubMed
  5. Shlapak DP, Mark IT, Kim DK, Benson JC, Diehn FE, Kissoon NR, Liebo GB, Madhavan AA, Morris JM, Morris PP, Oien MP, Verdoorn JT, Carr CM. Incremental diagnostic yield and clinical outcomes of lateral decubitus CT myelogram immediately following negative lateral decubitus digital subtraction myelogram. Neuroradiol J. 2023 Oct; 36(5):593-600. Epub 2023 Apr 27.
    View PubMed
  6. Mark IT, Black D, Benson JC, Campeau NG, Johnson DR, Messina SA, Giannini C, Parney I, Morris PP. Benign Enhancing Foramen Magnum Lesions. AJNR Am J Neuroradiol. 2023 Sep; 44 (9):999-1001 Epub 2023 Aug 03
    View PubMed
  7. Siminski CP, Carr CM, Kallmes DF, Oien MP, Atkinson JLD, Benson JC, Diehn FE, Kim DK, Liebo GB, Lehman VT, Madhavan AA, Mark IT, Morris PP, Shlapak DP, Verdoorn JT, Morris JM. Fluoroscopy- and CT-Guided Gold Fiducial Marker Placement for Intraoperative Localization during Spinal Surgery: Review of 179 Cases at a Single Institution-Technique and Safety Profile. AJNR Am J Neuroradiol. 2023 May; 44 (5):618-622 Epub 2023 Apr 20
    View PubMed
  8. Mark IT, Morris PP, Brinjikji W, Madhavan AA, Cutsforth-Gregory JK, Verdoorn JT. Sacral CSF-Venous Fistulas and Potential Imaging Techniques. AJNR Am J Neuroradiol. 2022 Dec; 43 (12):1824-1826 Epub 2022 Nov 03
    View PubMed
  9. Shah SS, Morris P, Buciuc M, Tajfirouz D, Wingerchuk DM, Weinshenker BG, Eggenberger ER, Di Nome M, Pittock SJ, Flanagan EP, Bhatti MT, Chen JJ. Frequency of Asymptomatic Optic Nerve Enhancement in a Large Retrospective Cohort of Patients With Aquaporin-4+ NMOSD. Neurology. 2022 Aug 23; 99 (8):e851-e857 Epub 2022 June 13
    View PubMed
  10. Madhavan AA, Carr CM, Benson JC, Brinjikji W, Diehn FE, Kim DK, Lehman VT, Liebo GB, Morris PP, Shlapak DP, Verdoorn JT, Morris JM. Diagnostic Yield of Intrathecal Gadolinium MR Myelography for CSF Leak Localization. Clin Neuroradiol. 2022 Jun; 32(2):537-545. Epub 2021 Jul 22.
    View PubMed
  11. Bambach S, Smith M, Morris PP, Campeau NG, Ho ML. Arterial Spin Labeling Applications in Pediatric and Adult Neurologic Disorders. J Magn Reson Imaging. 2022 Mar; 55 (3):698-719 Epub 2020 Dec 11
    View PubMed
  12. Jordan RW, Shlapak DP, Benson JC, Diehn FE, Kim DK, Lehman VT, Liebo GB, Madhavan AA, Morris JM, Morris PP, Verdoorn JT, Carr CM. Percutaneous CT-Guided Core Needle Biopsies of Head and Neck Masses: Review of 184 Cases at a Single Academic Institution, Common and Special Techniques, Diagnostic Yield, and Safety. AJNR Am J Neuroradiol. 2022 Jan; 43(1):117-124. Epub 2021 Dec 09.
    View PubMed
  13. Mustafa R, Passe TJ, Lopez-Chiriboga AS, Weinshenker BG, Krecke KN, Zalewski NL, Diehn FE, Sechi E, Mandrekar J, Kaufmann TJ, Morris PP, Pittock SJ, Toledano M, Lanzino G, Aksamit AJ, Kumar N, Lucchinetti CF, Flanagan EP. Utility of MRI Enhancement Pattern in Myelopathies With Longitudinally Extensive T2 Lesions. Neurol Clin Pract. 2021 Oct; 11 (5):e601-e611
    View PubMed
  14. Sechi E, Krecke KN, Messina SA, Buciuc M, Pittock SJ, Chen JJ, Weinshenker BG, Lopez-Chiriboga AS, Lucchinetti CF, Zalewski NL, Tillema JM, Kunchok A, Monaco S, Morris PP, Fryer JP, Nguyen A, Greenwood T, Syc-Mazurek SB, Keegan BM, Flanagan EP. Comparison of MRI Lesion Evolution in Different Central Nervous System Demyelinating Disorders. Neurology. 2021 Sep 14; 97 (11):e1097-e1109 Epub 2021 July 14
    View PubMed
  15. Jolliffe EA, Guo Y, Hardy TA, Morris PP, Flanagan EP, Lucchinetti CF, Tobin WO. Clinical and Radiologic Features, Pathology, and Treatment of Balo Concentric Sclerosis. Neurology. 2021 Jul 27; 97 (4):e414-e422 Epub 2021 May 19
    View PubMed
  16. Shlapak D, Kim DK, Diehn FE, Benson JC, Lehman VT, Liebo GB, Morris JM, Morris PP, Verdoom JT, Carr CM. Reply. AJNR Am J Neuroradiol 2021 Jul; 42 (7):E45 Epub 2021 Apr 22
    View PubMed
  17. Shlapak DP, Lanzino G, Morris PP, Theiler AR, Brinjikji W. Utility of CT venography in monitoring stent patency in idiopathic intracranial hypertension: retrospective single-center study. J Neurointerv Surg. 2021 May; 13 (5):478-482 Epub 2020 Aug 07
    View PubMed
  18. Kim DK, Carr CM, Benson JC, Diehn FE, Lehman VT, Liebo GB, Morris JM, Morris PP, Verdoorn JT, Cutsforth-Gregory JK, Atkinson JLD, Brinjikji W. Diagnostic Yield of Lateral Decubitus Digital Subtraction Myelogram Stratified by Brain MRI Findings. Neurology. 2021 Mar 2; 96 (9):e1312-e1318 Epub 2021 Jan 20
    View PubMed
  19. Banks SA, Morris PP, Chen JJ, Pittock SJ, Sechi E, Kunchok A, Tillema JM, Fryer JP, Weinshenker BG, Krecke KN, Lopez-Chiriboga AS, Nguyen A, Greenwood TM, Lucchinetti CF, Zalewski NL, Messina SA, Flanagan EP. Brainstem and cerebellar involvement in MOG-IgG-associated disorder versus aquaporin-4-IgG and MS. J Neurol Neurosurg Psychiatry. 2020 Dec 28 [Epub ahead of print]
    View PubMed
  20. Madhavan AA, Carr CM, Morris PP, Flanagan EP, Kotsenas AL, Hunt CH, Eckel LJ, Lindell EP, Diehn FE. Imaging Review of Paraneoplastic Neurologic Syndromes. AJNR Am J Neuroradiol. 2020 Dec; 41 (12):2176-2187 Epub 2020 Oct 22
    View PubMed
  21. Shlapak DP, Kim DK, Diehn FE, Benson JC, Lehman VT, Liebo GB, Morris JM, Morris PP, Verdoorn JT, Carr CM. Time to Resolution of Inadvertent Subdural Contrast Injection during a Myelogram: When Can the Study Be Reattempted? AJNR Am J Neuroradiol. 2020 Oct; 41 (10):1958-1962 Epub 2020 Aug 27
    View PubMed
  22. De Maria L, De Sanctis P, Tollefson M, Mardini S, Garrity JA, Morris PP, Bendel E, Brinjikji W. Sclerotherapy for low-flow vascular malformations of the orbital and periocular regions: Systematic review and meta-analysis. Surv Ophthalmol. 2020 Jan - Feb; 65 (1):41-47 Epub 2019 Aug 16
    View PubMed
  23. Kim DK, Brinjikji W, Morris PP, Diehn FE, Lehman VT, Liebo GB, Morris JM, Verdoorn JT, Cutsforth-Gregory JK, Farb RI, Benson JC, Carr CM. Lateral Decubitus Digital Subtraction Myelography: Tips, Tricks, and Pitfalls. AJNR Am J Neuroradiol. 2020 Jan; 41 (1):21-28 Epub 2019 Dec 19
    View PubMed
  24. Asnafi S, Morris PP, Sechi E, Pittock SJ, Weinshenker BG, Palace J, Messina S, Flanagan EP. The frequency of longitudinally extensive transverse myelitis in MS: A population-based study. Mult Scler Relat Disord. 2020 Jan; 37:101487 Epub 2019 Oct 31
    View PubMed
  25. Sechi E, Morris PP, McKeon A, Pittock SJ, Hinson SR, Weinshenker BG, Aksamit AJ, Krecke KN, Kaufmann TJ, Jolliffe EA, Zalewski NL, Zekeridou A, Wingerchuk DM, Jitprapaikulsan J, Flanagan EP. Glial fibrillary acidic protein IgG related myelitis: characterisation and comparison with aquaporin-4-IgG myelitis. J Neurol Neurosurg Psychiatry 2019 Apr; 90 (4):488-490 Epub 2018 July 21
    View PubMed
  26. Dubey D, Pittock SJ, Krecke KN, Morris PP, Sechi E, Zalewski NL, Weinshenker BG, Shosha E, Lucchinetti CF, Fryer JP, Lopez-Chiriboga AS, Chen JC, Jitprapaikulsan J, McKeon A, Gadoth A, Keegan BM, Tillema JM, Naddaf E, Patterson MC, Messacar K, Tyler KL, Flanagan EP. Clinical, Radiologic, and Prognostic Features of Myelitis Associated With Myelin Oligodendrocyte Glycoprotein Autoantibody. JAMA Neurol. 2019 Mar 1; 76 (3):301-309
    View PubMed
  27. Johnson DR, Guerin JB, Ruff MW, Fang S, Hunt CH, Morris JM, Morris PP, Pearse Morris P, Kaufmann TJ. Glioma response assessment: Classic pitfalls, novel confounders, and emerging imaging tools. Br J Radiol. 2019 Feb; 92 (1094):20180730 Epub 2018 Nov 14
    View PubMed
  28. Brinjikji W, Cloft HJ, Lanzino G, Rangel-Castilla L, Morris PP. Transarterial embolization of an internal maxillary artery arteriovenous fistula presenting with pulsatile tinnitus Neurosurgical Focus. 2019 Jan; 46 (Suppl 1):V6
  29. Chen JJ, Aksamit AJ, McKeon A, Pittock SJ, Weinshenker BG, Leavitt JA, Morris PP, Flanagan EP. Optic Disc Edema in Glial Fibrillary Acidic Protein Autoantibody-Positive Meningoencephalitis. J Neuroophthalmol. 2018 Sep; 38 (3):276-281
    View PubMed
  30. Morris PP, Geer CP, Singh J, Brinjikji W, Carter RE. Radiation dose reduction during neuroendovascular procedures. J Neurointerv Surg. 2018 May; 10 (5):481-486 Epub 2017 Sept 23
    View PubMed
  31. Morris PP, Lachman N, Black DF, Carter RA, Port J, Campeau N. Increased Curvature of the Tentorium Cerebelli in Idiopathic Intracranial Hypertension. AJNR Am J Neuroradiol. 2017 Sep; 38 (9):1789-1793 Epub 2017 June 29
    View PubMed
  32. Brinjikji W, Graffeo CS, Perry A, Zimmerman T, Janus JR, Morris PP, Cascino GD, Lanzino G. Moving target: transient rotational stenosis precipitating jugular bow hunter's syndrome. J Neurointerv Surg. 2017 Jul; 9 (7):e28 Epub 2017 Jan 06
    View PubMed
  33. Morris PP, Black DF, Port J, Campeau N. Transverse Sinus Stenosis Is the Most Sensitive MR Imaging Correlate of Idiopathic Intracranial Hypertension. AJNR Am J Neuroradiol. 2017 Mar; 38 (3):471-477 Epub 2017 Jan 19
    View PubMed
  34. Zalewski NL, Morris PP, Weinshenker BG, Lucchinetti CF, Guo Y, Pittock SJ, Krecke KN, Kaufmann TJ, Wingerchuk DM, Kumar N, Flanagan EP. Ring-enhancing spinal cord lesions in neuromyelitis optica spectrum disorders. J Neurol Neurosurg Psychiatry. 2017 Mar; 88 (3):218-225 Epub 2016 Dec 02
    View PubMed
  35. Flanagan EP, Hinson SR, Lennon VA, Fang B, Aksamit AJ, Morris PP, Basal E, Honorat JA, Alfugham NB, Linnoila JJ, Weinshenker BG, Pittock SJ, McKeon A. Glial fibrillary acidic protein immunoglobulin G as biomarker of autoimmune astrocytopathy: Analysis of 102 patients. Ann Neurol. 2017 Feb; 81 (2):298-309
    View PubMed
  36. Flanagan EP, Hinson SR, Lennon VA, Fang B, Aksamit AJ, Morris PP, Basal E, Honorat JA, Alfugham NB, Linnoila JJ, Weinshenker BG, Pittock SJ, McKeon A. Glial fibrillary acidic protein immunoglobulin G as biomarker of autoimmune astrocytopathy: Analysis of 102 patients Annals of Neurology. 2017; 81: (2)298-309.
  37. Brinjikji W, Graffeo CS, Perry A, Zimmerman T, Janus JR, Morris PP, Cascino GD, Lanzino G. Moving target: transient rotational stenosis precipitating jugular bow hunter's syndrome. BMJ Case Rep. 2016 Dec 20; 2016
    View PubMed
  38. Nguyen QD, Perry A, Graffeo CS, Nesvick CL, Raghunathan A, Jentoft ME, O'Neill BP, Morris PP, Morris JM, Van Gompel JJ. Gliosarcoma with Primary Skull Base Invasion. Case Rep Radiol. 2016; 2016:1762195. Epub 2016 Dec 08.
    View PubMed
  39. Koonce JD, Neal MT, Heck D, Wilson JA, Morris PP. Angiographic assessment of rotational vertebral artery syndrome (Bow Hunter's Syndrome): A case series. Neurographics.2013;3(2)100-7.
  40. William TJ, Bourland D, Couture DE, McMullen KP, Tatter SB, Morris PP. Definitive Treatment of Vein of Galen Aneursmal Malformation with Sterotactic Radiosurgery. Report of Two Cases. 2013.
  41. Edwards L, Kota G, Morris PP. The Sea Anchor Technique: A Novel Method to Aid in Stent-Assisted Embolization of Giant Cerebral Aneurysms. Journal of Neurointerventional Surgery. 2012.
  42. Singh J, Morris PP. Superficial Temporal Vein: Route to Embolization of Cavernous Dural Fistula. Journal of Neuroimaging. 2011:21(3):251-4.
  43. Lyders E, Whitlow CT, Baker MD, Morris PP. Imaging and Treatment of Sacral Insufficiency Fractures: A Review. American Journal of Neuroradiology. 2010:31(2):201-10.
  44. Whitlow C, Berry J, Geer C, Mattern C, Yazdani S, Lalli J, Claus R, Challa V, Morris PP. Endovascular Histologic Effects of Ultra-Thin Gold or Vitronectin Coated Platinum Aneurysm Coil in a Rodent Arterial Occlusion Model: A Preliminary Investigation. American Journal of Neuroradiology. 2009:30:85-90.
  45. Cohen SD, Goins JL, Butler SG, Morris PP, Browne JD. Dural Arteriovenous Fistula: Diagnosis, Treatment, and Outcomes. Laryngoscope. 2009:119(2):293-7.
  46. Steven EA, Powers AK, Morris PP, Wilson JA. Occult Dural Arteriovenous Fistula Causing Rapidly Progressive Conus Medularis Syndrome and Paraplegia After Lumber Microdiscectomy. Spine Journal. 2009:9(9):e8-12.
  47. Lyders E, Morris PP. A Case of Spinal Cord Infarction Following Lumbar Transforaminal Epidural Steroid Injection: MRI and Angiographic Findings. American Journal of Neuroradiology. 2009:30(9):1691-3.
  48. Pollock JM, Powers E, Stevens A, Sanghavi AN, Wilson JA, Morris PP. Ruptured Anterior Spinal Artery Aneurysm with Chiari 1 Malformation: A Case Report. Journal of Neuroimaging. 2008:XX:1-2.
  49. Whitlow CT, Yazdani SK, Reedy ML, Kaminsky SE, Berry JL, Morris PP. Investigating Sacroplasty: Technical Considerations and Finite Element Analysis of Polymethylmethacrylate Infusion into Cadaveric Sacrum. American Journal of Neuroradiology. 2007:28(6):1036-41.
  50. Whitlow CT, Mussat-Whitlow BJ, Mattern CWT, Baker MD, Morris PP. Sacroplasty versus Vertebroplasty: Comparable Clinical Outcomes for the Treatment of Fracture-Related Pain. American Journal of Neuroradiology. 2007:28(7):1266-70.
  51. Campbell J, Morris PP. Cerebral Vasculitis in Graft-versus-Host Disease: A Case Report. American Journal of Neuroradiology. 2005:26:654-656.
  52. Burbank NS, Morris PP. Unique Anomalous Origin of the Left Anterior Cerebral Artery. American Journal of Neuroradiology. 2005:26(10):2533-5.
  53. Given CA, Thacker IC, Baker MD, Morris PP. Fluoroscopy Fade for Embolization of Vein of Galen Malformation. American Journal of Neuroradiology. 2003:24:267-270.
  54. Pommersheim W, Huang-Hellinger F, Baker M, Morris PP. Sacroplasty: A Treatment for Sacral Insufficiency Fractures. American Journal of Neuroradiology. 2003:24:1003-1007.
  55. Rabinov JD, Hellinger FR, Morris PP, Ogilvy CS, Putman CM. Endovascular Management of Vertebrobasilar Dissecting Aneurysms. American Journal of Neuroradiology. 2003:24:1421-1428.
  56. Acharya VJ, Acharya SN, Tegeler CH, Morris PP, Meads D, O'Donovan C. Transcranial Doppler Ultrasound: A New Method of Monitoring Hemispheric Anesthetization During Intracarotid Amobarbital Procedure. Journal of Neuroimaging. 2002:12:1-5.
  57. Given CA, Morris PP. Recognition and Importance of an Infraoptic Anterior Cerebral Artery: Case Report. American Journal of Neuroradiology. 2002:23:452-454.
  58. Hamberg L, Hunter GJ, Maynard KI, Owen C, Morris PP, Putnam CM, Ogilvy C, Gonzalez RG. Functional CT Perfusion Imaging in Predicting the Extent of Cerebral Infarction from a 3-Hour Middle Cerebral Artery Occlusion in a Primate Stroke Model. American Journal of Neuroradiology. 2002:23:1013-1021.
  59. Opatowsky MJ, Browne JD, McGuirt WF, Morris PP. Endovascular Treatment of Post-Tonsillectomy Hemorrhage in Children. American Journal of Neuroradiology. 2001:22:713-716.
  60. Baker MD, Opatowsky MJ, Wilson JA, Glazier SS, Morris PP. Rheolytic Catheter and Thrombolysis of Dural Venous Sinus Thrombosis: A Case Series. Neurosurgery. 2001:48:487-494.
  61. Given CA, Huang-Hellinger FR, Baker MD, Chepuri NB, Morris PP. Congenital Absence of the Internal Carotid Artery: Case Reports and Review of the Collateral Circulation. American Journal of Neuroradiology. 2001:22:1953-59.
  62. Opatowsky M, Morris PP, Mewborne J, Regan J, Wilson J. Rapid thrombectomy of superior sagittal sinus using rheolytic catheter device. American Journal of Neuroradiology. 1999:20:414-417.
  63. Morris PP. Balloon Reconstructive Technique in Treatment of a Carotid Cavernous Fistula. American Journal of Neuroradiology. 1999:20:1107-09.
  64. Morris PP. Staged Endovascular Management of a Ruptured Intracranial Aneurysm. Interventional Neuroradiology. 1999:5:45-49.
  65. Morris PP, Braden G. Neurointerventional Experience with an Arteriotomy Suture Device. American Journal of Neuroradiology. 1999:20:1706-09.
  66. Morris PP, Braden G, Regan J. Intracranial Deployment of Corornary Stents for Treatment of Atherosclerotic Disease. American Journal of Neuroradiology. 1999:20:1688-94.
  67. Morris PP. Interventional Neuroradiology in the Treatment of Brain Tumors. North American Clinics in Neuroradiology. 1999:9:767-778.
  68. Hunter GJ, Hamberg LM, Ponzo JA, Huang-Hellinger FR, Morris PP, Rabinov FJ, Lev MH, Schaefer PW, Ogilvy CS, Schwamm L, Buonanno FS, Koroshetz WJ, Wolf GL, Gonzalez RG. Assessment of cerebral perfusion and arterial anatomy in hyperacute stroke with three-dimensional functional CT: early clinical results American Journal of Neuroradiology. 1998:19(1):29-37.
  69. Lev M, Khanduja K, Morris PP, Curtain HD. Parotid Pleomorphic Adenomas: delayed CT enhancement. American Journal of Neuroradiology. 1998:19:1835-39.
  70. Raffaele KC, Asthana S, Berardi A, Haxby JV, Morris PP, Shapiro MB, Soncrant TT. Differential response to the cholinergic agonist arecoline among different cognitive modalities in Alzheimer's disease. Neuropsychopharmacology. 1996:15:163-170.
  71. Morris PP, Choi IS. Cerebral vascular anatomy. Neuroimaging Clin North AM. 1996:6:541-560.
  72. Asthana S, Raffaele KC, Greig NH, Berardi A, Morris PP, Schapiro MB, Rapoport SI, Blackman MR, Soncrant TT. Neuroendocrine responses to intravenous infusion of arecoline in patients with Alzheimer's disease Psychoneuroendocrinology. 1995:20:623-635.
  73. Soncrant TT, Raffaele KC, Asthana S, Berardi A, Morris PP, Haxby JV. Memory improvement without toxicity during chronic low-dose intravenous arecoline in Alzheimer's disease. Psychopharmacology (Berl). 1993:112:421-427.
  74. Raffaele KC, Berardi AM, Morris PP, Asthana S, Haxby JV, Schapiro MB, Rapoport SI, Soncrant TT. Effects of acute infusion of muscarinic agonist arecoline on verbal memory and visuospatial function in dementia of Alzheimer type. Prog Neuropsychopharmacol Biol Psychiatry. 1991:15:643-648.
  75. Raffaele KC, Berardi AM, Morris PP, et al. Effects of long-term continuous infusion of the muscarinic cholinergic agonist arecoline on verbal memory in dementia of the Alzheimer type. Psychopharmacol Bull. 1991:27:315-319.
  76. Morris PP, Rapoport SI. Neuroimaging and Affective Disorder of Late Life: A Review. Can J Psychiatry. 1990:35:347-354.
  77. Rapoport SI, Morris PP. Depression and Dementia in the Elderly: Relation to Multiinfarct Disease. Dementia and Depression, Fifth Congress of the Foundation of Gerontology. 1989.