Khattab M S, Abolfotouh M A, Al-Khaldi Y M, Khan M Y
Department of Family and Community Medicine, King Saud University, and Wasat Abha Primary Health Care Center, Abha, Saudi Arabia.
Ann Saudi Med. 1999 Mar-Apr;19(2):167-70. doi: 10.5144/0256-4947.1999.167.