Acknowledgement
This research was supported by Dr. Kaewjai Tepsuthumarat (Khon Kaen University, Khon Kaen, Thailand) and Dr. Phruttinun Surit (Naresuan University, Phitsanulok, Thailand), who gave advice on statistical content. Staff of Speech Clinic, Srinagarind Hospital, and Tawanchai Foundation, Khon Kaen University supported for assessment and collecting data.
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