1. Department of Pediatrics; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok, Thailand
2. Department of Microbiology; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok, Thailand
3. Microbiological Laboratory; Queen Sirikit National Institute of Child Health; Bangkok, Thailand
4. Department of Microbiology; Chulalongkorn University; Bangkok, Thailand
5. Microbiological Laboratory; Bhumipol Adulyadej Hospital; Bangkok, Thailand