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Theodore Fotsis Fotsis; Paula Jervenpee; Herman Adlercreutz (13 January 2009) . "Identification of 4-Hydroxyestriol in Pregnancy Urine". The Journal of Clinical Endocrinology and Metabolism. 51 (1): 148–151. doi:10.1210/jcem-51-1-148. PMID6892918.