1. Unconventional medicine in the United States: prevalence, costs, and patterns of use;Eisenberg;N Engl J Med,1993
2. Mosby’s handbook of herbs and natural supplements;Skidmore-Roth,2001
3. Pharmacist’s guide to medicinal herbs;Presser,2000
4. Assessing the risks and benefits of herbal medicine: an overview of scientific evidence;Barrett;Altern Ther Health Med,1999
5. Herbal supplements: considerations in dental practice;Cohan;J Calif Dent Assoc,2000