RT Journal Article SR Electronic T1 Effort Thrombosis JF The Journal of the American Board of Family Practice JO J Am Board Fam Med FD American Board of Family Medicine SP 293 OP 294 DO 10.3122/jabfm.2.4.293c VO 2 IS 4 A1 Darios, Robert J. YR 1989 UL http://www.jabfm.org/content/2/4/293.2.abstract AB