TY - JOUR T1 - Urinary estriol estimations in normal and abnormal pregnancies JF - Canadian Medical Association Journal JO - CMAJ SP - 1098 LP - 1101 VL - 94 IS - 21 AU - R. L. Willows Y1 - 1966/05/21 UR - http://www.cmaj.ca/content/94/21/1098.abstract ER -