RT Journal Article SR Electronic T1 Cecil Textbook of Medicine. 19th edition JF The Journal of the American Board of Family Practice JO J Am Board Fam Med FD American Board of Family Medicine SP 659 OP 659 DO 10.3122/jabfm.5.6.659a VO 5 IS 6 A1 Bergman, James YR 1992 UL http://www.jabfm.org/content/5/6/659.2.abstract AB