National Registry of Diseases Office Singapore Stroke Registry NRST112 HIST_SMOKING History of smoking Y=yes, N=no/never, E=ex, C=current, M=missing 2005-2021
National Registry of Diseases Office Singapore Stroke Registry NRST112 HIST_SMOKING History of smoking Y=yes, N=no/never, E=ex, C=current, M=missing 2005-2021