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Efficacy and safety of comfrey root extract ointment in the treatment of acute upper or lower back pain: results of a double-blind, randomised, placebo controlled, multicentre trial
- Correspondence to Dr C Staiger, Merck Selbstmedikation GmbH, Roesslerstrasse 96, 64293 Darmstadt, Germany; christiane.staiger{at}merck.de
Citation
Efficacy and safety of comfrey root extract ointment in the treatment of acute upper or lower back pain: results of a double-blind, randomised, placebo controlled, multicentre trial
Publication history
- Accepted March 2, 2009
- First published May 21, 2009.
Online issue publication
June 29, 2010
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