Concordance of self-reported hormonal contraceptive use and presence of exogenous hormones in serum among African women.
Pyra M, Lingappa JR, Heffron R, Erikson DW, Blue SW, Patel RC, Nanda K, Rees H, Mugo NR, Davis NL, Kourtis AP, Baeten JM. Concordance of self-reported hormonal contraceptive use and presence of exogenous hormones in serum among African women. Contraception. 2018 04; 97(4):357-362.