Evidence-based medicine in obstetrics: can levels B and C recommendations be elevated to level A recommendations?
Chauhan SP, Chang E, Brost B, Assel B, Baxter J, Smith JA, Grobman R, Berghella V, Scardo JA, Magann EF, Morrison JC. Evidence-based medicine in obstetrics: can levels B and C recommendations be elevated to level A recommendations? Obstet Med. 2009 Jun; 2(2):63-6.