[A study on the time of collection of urine specimen for determination of E/C (author's transl)].
D003404:Creatinine / Q000652:urine*; D004967:Estrogens / Q000652:urine*; D005260:Female; D006801:Humans; D011247:Pregnancy; D013048:Specimen Handling; D013997:Time Factors
D004967:Estrogens; D003404:Creatinine