aSchool of Medicine and Dentistry

bInstitute for Integrated and Intelligent Systems, Griffith University, Gold Coast

cRural Health Research Institute, Charles Sturt University, Leeds Parade, Australia

Correspondence to Jing Sun, Distinguished Professor and Chair of Biostatistics, Rural Health Research Institute, Charles Sturt University, New South Wales 2800, Australia. Tel: +61 421711366; e-mail: [email protected]

Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Website (www.co-psychiatry.com).