title: Asia.
authors.affiliation: Department of Obstetrics and Gynecology, Rajavithi Hospital, Bangkok, Thailand.
authors.forename: K
authors.initials: K
authors.lastname: Vairojanavong
mesh_terms: D002681:China; D006801:Humans; D007194:India; D007221:Industry; D007564:Japan; D014463:Ultrasonography / Q000191:economics / Q000295:instrumentation / Q000379:methods*