1. School of Social Welfare, Bukkyo University, Kyoto 603-8301, Japan
2. Department of Epidemiology and Global Health, Umeå University, 90737 Umeå, Sweden
3. Wakayama Seikyo Hospital, Wakayama 640-8390, Japan
4. Department of Community Paediatrics, South Western Sydney Local Health District, Liverpool, NSW 1871, Australia
5. Division of Mental Health and Wellbeing, Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK