REFERENCES All Passenger Facility Shopping Center Residential Hospital/Facility Public Others Gran SeoulSouth Korea Gran SeoulSouth Korea MORE Sengkang HospitalSingapore Sengkang HospitalSingapore MORE BEXCOSouth Korea BEXCOSouth Korea MORE Changwon gyeongsang univ. hospitalSouth Korea Changwon gyeongsang univ. hospitalSouth Korea MORE MBC SangamSouth Korea MBC SangamSouth Korea MORE Pohang sungmo HospitalSouth Korea Pohang sungmo HospitalSouth Korea MORE