%0 Journal Article %T Combination of Comfrey Root Extract Plus Methyl Nicotinate in Patients with Conditions of Acute Upper or Low Back Pain: A Multicentre Randomised Controlled Trial %A Pabst, Helmut %A Schaefer, Axel %A Staiger, Christiane %A Junker‐Samek, Marc %A Predel, Hans‐Georg %J Phytotherapy Research %V 27 %N 6 %P 811-817 %@ 0951-418X %D 2013-06-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve