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Chang WH, Wang KC, Lee NR, Huang N, Su WH, Chao HT, Yen MS, Fuh JL, Wang PH.Chang WH, et al. Among authors: chao ht.Taiwan J Obstet Gynecol. 2013 Mar;52(1):39-45. doi: 10.1016/j.tjog.2013.01.007.Taiwan J Obstet Gynecol. 2013.PMID: 23548216Free article.Clinical Trial.