Immediate effects of sitting position on cervical and trunk posture, perceived discomfort, and RULA-based ergonomic risk during smartphone gaming: A randomized within-subject study - Patcharin Nilmart; Wantanee Yodchaisarn; Natdanai Vajidee; Nounchanok Tansakul; Wirada Sramongkhol; Sasisom Leangsakul (PLoS ONE, 2026)