RT Journal Article SR Electronic T1 Retina ed. by Steven J. Ryan, MD JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 492 OP 492 VO 57 IS 5 A1 Zakov, Z. Nicholas YR 1990 UL http://www.ccjm.org/content/57/5/492.2.abstract AB