1. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Solna, Sweden (Chen, Chang, Kuja-Halkola, D’Onofrio, Larsson, Lichtenstein, Pettersson); Department of Psychological and Brain Sciences, Indiana University, Bloomington (D’Onofrio); School of Medical Sciences, Örebro University, Örebro, Sweden (Larsson); Unit of Cardiology, Department of Medicine, Karolinska Institutet, and Heart and Vascular Division, Karolinska University Hospital, Stockholm (Andell).