Patient preferences for incentives in Contingency Management interventions in methadone treatment: A best-worst scale analysis - Thuy Thi Dieu Dao; Hue Thi Nguyen; Trang Thu Nguyen; Thuyet Thi Phung; Van Hai Hoang; Huong Thi Le; Brian W. Pence; Giang Minh Le; Vivian F. Go; William C. Miller (PLoS ONE, 2026)