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Schumacher GE, Barr JT.Schumacher GE, et al.Ther Drug Monit. 1998 Oct;20(5):539-42. doi: 10.1097/00007691-199810000-00016.Ther Drug Monit. 1998.PMID: 9780132Review.
Barr JT, Schumacher GE.Barr JT, et al. Among authors: schumacher ge.J Am Diet Assoc. 2003 Feb;103(2):177-80. doi: 10.1053/jada.2003.50058.J Am Diet Assoc. 2003.PMID: 12589322No abstract available.