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Developing a patient-centered outcome measure for complementary and alternative medicine therapies II: Refining content validity through cognitive interviews

Jennifer J Thompson, Kimberly L Kelly, Cheryl Ritenbaugh*, Allison L Hopkins, Colette M Sims and Stephen J Coons

BMC Complementary and Alternative Medicine 2011, 11:136  doi:10.1186/1472-6882-11-136