article 1987 Estimation of 13, 14-dihydro-15-keto-prostaglandin F2 alpha (PGF2 alpha M) in patients with endometriosis. Proceedings of the Chinese Academy of Medical Sciences and the Peking Union Medical College = Chung-kuo i hsueh k'o hsueh yuan, Chung-kuo hsieh ho i k'o ta hsueh hsueh pao