Source: http://heinonline.org/HOL/LandingPage?handle=hein.journals/ilmed30&div=18&id=&page=

The Use of Isomolecular Progesterone in the Support of Pregnancy and Fetal Safety.
Hilgers TW, Keefe CE, Pakiz KA.
Issues Law Med. 2015 Autumn;30(2):159-68.
PMID: 26710374