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Following the 2009 American Institute of Medicine recommend..:

Tsai, Yieh-Loong ; Chong, Kian-Mei ; Seow, Kok-Min
Taiwanese Journal of Obstetrics and Gynecology.  52 (2013)  3 - p. 341-346 , 2013
Link: https://doi.org/10.1016/j.tjog.2013.05.001