Genetic risk score analysis indicates migraine with and without comorbid depression are genetically different disorders

Lannie Ligthart; Jouke-Jan Hottenga; Cathryn M. Lewis; Anne E. Farmer; Ian W. Craig; Gerome Breen; Gonneke Willemsen; Jacqueline M. Vink; Christel M. Middeldorp; Enda M. Byrne; Andrew C. Heath; Pamela A. F. Madden; Michele L. Pergadia; Grant W. Montgomery; Nicholas G. Martin; Brenda W. J. H. Penninx; Peter McGuffin; Dorret I. Boomsma; Dale R. Nyholt