Preferences for orthodontic treatment attributes among young adult malocclusion patients in Anhui, China: a discrete choice experiment - Fangyu Song; Dandan Yu; Shan Jiang; Yihui Li; Yuguang Liu; Wang Yao; Han Cheng; Jianguang Xu; Wenhua Xu; Lidan Wang; Yuanyuan Gu (BMC Oral Health, 2026)