1. Department of Child and Adolescent Psychiatry and Department of Population Health, New York University, New York, NY, and Department of Statistics, University of Haifa, Haifa, Israel
2. Integrated Statistics, Woods Hole, MA, and Centre for Research into Ecological and Environmental Modelling and School of Mathematics and Statistics, University of St Andrews, St Andrews, United Kingdom
3. Department of Child and Adolescent Psychiatry, New York University, New York, NY