1. Department of Medicine, National University Health System, 5 Lower Kent Ridge Road, Singapore 119074, Singapore
2. Department of Laboratory Medicine, Changi General Hospital, 2 Simei Road 3, Singapore 529889, Singapore
3. College of Pharmacy, University of Houston, 1441 Moursund, Houston, Texas 77030
4. Department of Pharmacy
5. Department of Pathology, Singapore General Hospital, Outram Road, Singapore 169608, Singapore