[1] Natl Univ Singapore Hosp, Natl Univ Heart Ctr, Cardiovasc Res Inst, Singapore 119228, Singapore
[2] Natl Univ Heart Ctr, Natl Univ Hosp, Dept Cardiol, Singapore 119228, Singapore
[3] Changi Gen Hosp, Dept Cardiol, Singapore 529889, Singapore
[4] Changi Gen Hosp, Res Lab, Singapore 529889, Singapore
[5] Natl Univ Heart Ctr, Dept Cardiol, 1E Kent Ridge Rd,NUHS Tower Block Level 9, Singapore 119228, Singapore