Comparison of different scoring methods based on latent variable models of the PHQ-9 : protocol for an individual participant data meta-analysis

Evaluation of a blended-learning training concept to train oncology physicians to advise their patients about complementary and integrative medicine (KOKON-KTO): study protocol for a prospective, multi-center, cluster-randomized trial

**Background:** Many cancer patients are interested in complementary and integrative medicine during and after regular cancer treatment. Given the high number of users it is important that physicians and patients engage in a dialog about useful …

Validity of instrument-independent depression metrics – protocol for a meta-study