1. From the Department of Biomedical Kinesiology, Faculty of Kinesiology and Rehabilitation Sciences (MWP, GPB, ALC, and MAT), Department of Human Genetics, Faculty of Medicine (RV), Katholieke Universiteit Leuven, Leuven, Belgium; Virginia Institute for Psychiatric and Behavioral Genetics, Department of Human Genetics, Virginia Commonwealth University, Richmond, VA (HHM); and Medical Research Counc