RT Journal Article SR Electronic T1 A tribute to Penn G. Skillern, MD JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 207 OP 207 VO 55 IS 3 A1 Schumacher, O. Peter YR 1988 UL http://www.ccjm.org/content/55/3/207.abstract AB