Comparative Efficacy and Patient-centered Outcomes of Intraoral Submucosal Zonal Injection Versus Traditional Extra-oral Injection for Improving Perioral Contour: A Randomized Controlled Trial. - Wang Y; Shi L; Zhang Y; Xiu J; Dai L; Yin M; Dang W; Wang Q; Tan L; Cui H (Aesthetic plastic surgery, 2026)