Booranasuntikul B, Kanchanakhan N. Effect of using smartphone before bedtime and sleep quality of middle-adulthood officers at Chulalongkorn University. Chula Med J [internet]. 2021 Apr. 1 [cited 2025 Apr. 6];65(2). available from: https://he05.tci-thaijo.org/index.php/CMJ/article/view/1079