Homeopathic Treatment of Patients with Migraine: A Prospective Observational Study with a 2-Year Follow-Up Period 04-01-2010 Author: Claudia M. Witt, M.D., M.B.A., Rainer Lu¨dtke, M.S.C., and Stefan N. Willich, M.D., M.P.H., M.B.A.