1. Laboratory reproducibility of endogenous hormone levels in postmenopausal women;Hankinson;Cancer Epidemiol Biomarkers Prev,1994
2. Reproducibility of laboratory assays for steroid hormones and sex hormone-binding globulin;Potischman;Cancer Res,1994
3. Elusive estrogens may hold key to some cancer risk;Holzman;J Natl Cancer Inst,1995
4. Reproducibility studies and interlaboratory concordance for assays of serum hormone levels;Gail;Cancer Epidemiol Biomarkers Prev,1996
5. Reliability and validity of serum sex hormone measurements;McShane;Cancer Epidemiol Biomarkers Prev,1996