PT - JOURNAL ARTICLE AU - Behm, A. R. AU - Unger, W. P. TI - Oral contraceptives and porphyria cutanea tarda DP - 1974 May 04 TA - Canadian Medical Association Journal PG - 1052--1054 VI - 110 IP - 9 4099 - http://www.cmaj.ca/content/110/9/1052.short 4100 - http://www.cmaj.ca/content/110/9/1052.full SO - CMAJ1974 May 04; 110