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Horneber, Markus; Bueschel, Gerd; Dennert, Gabriele; Less, Danuta; Ritter, Erik; Zwahlen, Marcel (2012). How many cancer patients use complementary and alternative medicine: a systematic review and metaanalysis. Integrative cancer therapies, 11(3), pp. 187-203. Thousand Oaks, Calif.: Sage Publications 10.1177/1534735411423920
