Efficacy of a standardized echinacea preparation (EchinilinTM) for the treatment of the common cold: a randomized, double‐blind, placebo‐controlled trial
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R. Bauer | M. Lyon | V. Goel | T. Basu | R. Barton | R. Lovlin | T. Lee | M. R. Lyon | T. K. Basu | Richard E. Barton | T. K. Basu | Ray Lovlin | M. R. Lyon | T. D. G. Lee