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Merz TM, Treyer V, Hefti U, Spengler CM, Schwarz U, Buck A, Maggiorini M.Merz TM, et al. Among authors: spengler cm.High Alt Med Biol. 2006 Spring;7(1):28-38. doi: 10.1089/ham.2006.7.28.High Alt Med Biol. 2006.PMID: 16544964Clinical Trial.