1. Trends in the use of complementary health approaches among adults: United States, 2002-2012;Clarke;Natl Health Stat Report,2015
2. Saw palmetto extracts for treatment of benign prostatic hyperplasia: a systematic review;Wilt;JAMA,1998
3. The ABC clinical guide to herbs;Blumenthal,2003
4. Nature’s pharmacopeia: a world of medicinal plants;Choffnes,2016