Development and validation of a Chinese translated questionnaire: A single simultaneous tool for assessing gastrointestinal and upper respiratory tract related illnesses in pre-sch... by Amy S.Y. Lau, MSc, Muhamad S.B. Yusoff, MD, Yeong-Yeh Lee, MD, Sy-Bing Choi, PhD, Jin-Zhong Xiao, PhD, Min-Tze Liong, PhD

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