1. Emergency Medicine Unit, Outpatient Department, King Chulalongkorn Memorial Hospital, The Thai Red Cross Society, Bangkok, Thailand;
2. Emergency Medicine Unit, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand;
3. Bhumirajanakarindra Kidney Institute Hospital, Bangkok, Thailand;
4. Division of Nephrology, Department of Medicine, King Chulalongkorn Memorial Hospital, Thai Red Cross Society and Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand