Eighteen surveys were carried out in 17 countries in the Americas (Colombia, Mexico, US), Europe (Belgium, France, Germany, Italy, Netherlands, Spain, Ukraine), the Middle East and Africa (Israel, Lebanon, Nigeria, South Africa), Asia (Japan, and separate surveys in Beijing and Shanghai in the People's Republic of China), and Oceania (New Zealand). This set of countries was determined by availability of collaborators in the country who were able to obtain funding for the survey and complete the World Mental Health Surveys (WMHS) protocol. Details of each sample are presented in Table 1 (see also http://www.hcp.med.harvard.edu/wmh/) [27].
