Witt C, Luedtke R, Mengler N, Willich S. How healthy are chronically ill patients after eight years of homeopathic treatment? - Results from a long term observational study. BMC Public Health, 2008. 8:413.

Witt C, Luedtke R, Baur R, Willich S. Homeopathic medical practice: long-term results of a cohort study with 3981 patients. BMC Public Health, 2005. 5:115.

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