ACKNOWLEDGMENTS
We are grateful to Prof. Niwat Maneekarn and Assoc Prof. Pattara Khamrin for reviewing the manuscript. This study was partially supported by grants-in-aid from Research and Development Institute, Pibulsongkram Rajabhat University, Thailand. The authors gratefully acknowledge pediatric physicians, nurses, and assistants of Pediatric Unit, Chiangrai Prachanukroh Hospital for stool specimen collection.