1. Department of Child Psychiatry Kangning Hospital of Shenzhen Shenzhen P.R. China
2. Department of Pediatrics, Foshan University Foshan Maternity and Child Health Care Hospital Foshan P.R. China
3. Queensland Centre for Mental Health Research the Park Centre for Mental Health Brisbane Queensland Australia
4. Queensland Brain Institute University of Queensland St Lucia Queensland Australia
5. National Centre for Register‐based Research Department of Economics and Business Economics Aarhus University Aarhus Denmark