PT - JOURNAL ARTICLE AU - Boghos L. Artinian TI - Vertical Evolution DP - 2000 Jul 01 TA - Saudi Medical Journal PG - 695--695 VI - 21 IP - 7 4099 - http://smj.org.sa/content/21/7/695.2.short 4100 - http://smj.org.sa/content/21/7/695.2.full SO - Saudi Med J2000 Jul 01; 21