[1] Natl Univ Singapore, Alice Lee Ctr Nursing Studies, Yong Loo Lin Sch Med, Singapore, Singapore
[2] Natl Healthcare Grp, Corp Off, Singapore, Singapore
[3] Natl Univ Singapore, Saw Swee Hock Sch Publ Hlth, Singapore, Singapore
[4] Natl Univ Hlth Syst, Singapore, Singapore
[5] Singapore Gen Hosp, Div Nursing, Singapore, Singapore
[6] Univ Eastern Finland, Dept Nursing Sci, Kuopio, Finland
[7] Kuopio Univ Hosp, Kuopio, Finland
[8] Natl Univ Singapore, Alice Lee Ctr Nursing Studies, Clin Res Ctr, Yong Loo Lin Sch Med, Level 2,Bock MD11,10 Med Dr, Singapore 117597, Singapore