PT - JOURNAL ARTICLE AU - Larsen, Kathryn M. TI - Difficult Diagnosis 2 AID - 10.3122/jabfm.5.5.549a DP - 1992 Sep 01 TA - The Journal of the American Board of Family Practice PG - 549--549 VI - 5 IP - 5 4099 - http://www.jabfm.org/content/5/5/549.2.short 4100 - http://www.jabfm.org/content/5/5/549.2.full SO - J Am Board Fam Med1992 Sep 01; 5