Has subject area For 2008 4 Digit Code Applied Economics Policy and Administration Public Health and Health Services For 2008 6 Digit Code Environmental and Occupational Health and Safety Public Health and Health Services not elsewhere classified Rfcd 1998 6 Digit Code Environmental and Occupational Health and Safety Public Health and Health Services not elsewhere classified Seo 1998 6 Digit Code Mental Health Social Ethics Social Structure and Health Seo 2008 6 Digit Code Mental Health Social Ethics Social Structure and Health