Comparison of methods to measure low serum estradiol levels in postmenopausal women.
J Clin Endocrinol Metab 91(10):3791-7 (2006) PMID 16882749
Accurate measurement of low serum estradiol (E(2) < 30 pg/ml or < 110 pmol/liter) is needed to study relationships between endogenous E(2) and risks of diseases in older women.
DOI: 10.1210/jc.2005-2378
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