1 St Luke's Medical Center College of Medicine, William H Quasha Memorial, 1112 Quezon City, Philippines.
2 College of Medicine, University of the Philippines, Manila, Philippines.
3 Department of Internal Medicine, Albert Einstein Medical Center, PA, USA.
4 St Luke's Medical Center College of Medicine, William H Quasha Memorial, 1112 Quezon City, Philippines; Sunway Centre for Planetary Health, Sunway University, Petaling Jaya, Malaysia. Electronic address: guinto.rl.f@slmc-cm.edu.ph.