Chew WF, Rokiah P, Chan SP, Chee SS, Lee LF, Chan YM
Singapore Med J 2012; 53(12): 814–820
On page 815, Methods section, paragraph 2, lines 9–11, the correct sentence should be, “Therefore, the formula used for this study should be n = [1.962 × (0.126 × 0.874)]/ 0.052, and the sample size needed was 169.”
Singapore Med J 2013; 54:58; http://dx.doi.org/10.11622/smedj.2013022