title: Which is preferred: 20G or 22G needle at amniocentesis?
authors.forename: Dong-Zhi
authors.initials: DZ
authors.lastname: Li
mesh_terms: D000328:Adult; D000649:Amniocentesis / Q000295:instrumentation*; D005260:Female; D005865:Gestational Age; D006801:Humans; D007431:Intraoperative Complications; D009339:Needles / Q000009:adverse effects*; D010920:Placenta / Q000293:injuries; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D016037:Single-Blind Method; D014592:Uterine Hemorrhage / Q000175:diagnosis / Q000209:etiology*