Prevalence of and factors associated with poor sleep quality and short sleep in a working population in Singapore - Visvalingam, N; Sathish, T; Soljak, M; Ping, CA; Dunleavy, G; Divakar, U; Nazeha, N; Bajpai, R; Soh, CK; Woon, KK; Christopoulos, G; Car, J (Sleep Health, 2019)