Umph
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Introduction
More general terms
References
- ↑ Prescriber's Letter 11(9): 2004 Energy and Anti-fatigue Supplements Detail-Document#: http://prescribersletter.com/(5bhgn1a4ni4cyp2tvybwfh55)/pl/ArticleDD.aspx?li=1&st=1&cs=&s=PRL&pt=3&fpt=25&dd=200606&pb=PRL (subscription needed) http://www.prescribersletter.com