title: [Analysis the original cause of 623 infertility couples to be taken in vitro fertilization in the northwest region of China].
authors: The Center of Reproductive Medecine Research, The First Hospital of Lanzhou University, Lanzhou 730000, China.
authors: Kun
authors: K
authors: Liu
authors: Xue-hong
authors: XH
authors: Zhang
mesh_terms: D000328:Adult; D002681:China; D005260:Female; D005307:Fertilization in Vitro / Q000379:methods*; D006801:Humans; D007246:Infertility / Q000453:epidemiology / Q000209:etiology* / Q000628:therapy*; D008297:Male