Effect of an vitamin D deficiency on depressive symptoms in child and adolescent psychiatric patients – a randomized controlled trial: study protocol
M. Föcker, J. Antel, C. Grasemann, D. Führer, N. Timmesfeld, D. Öztürk, T. Peters, A. Hinney, J. Hebebrand, L. Libuda, BMC Psychiatry (2018).