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Figure 1: (a-d) The error plot for five periods of assessments for general health questionnaire 1 (ghq1); GHQ2 (ghq2), GHQ3 (ghq3), and GHQ4 (ghq4). The period of assessments are November–December 2007 (nd07); April 2008 (ap08); June 2008 (jun08); August 2008 (aug08); and November 2008 (nov08)

Figure 1: (a-d) The error plot for five periods of assessments for general health questionnaire 1 (ghq1); GHQ2 (ghq2), GHQ3 (ghq3), and GHQ4 (ghq4). The period of assessments are November–December 2007 (nd07); April 2008 (ap08); June 2008 (jun08); August 2008 (aug08); and November 2008 (nov08)