“…Eighteen studies met our criteria for inclusion in the meta-analysis: eight first-contact incidence studies (3,10,11,13,15,16,27,30) that included both inpatients and outpatients and 10 hospital-based first-admissions studies (4,14,17,18,28,29,(31)(32)(33)(34), four of which were national register studies (4,18,29,34). One study was conducted in Australia (31), and the remainder in the United Kingdom, the Netherlands, Denmark, and Sweden.…”