Factors associated with retention in Quitline counseling for smoking cessation among HIV-positive smokers receiving care at HIV outpatient clinics in Vietnam. - Nguyen, Nam Truong; Nguyen, Trang; Vu, Giap Van; Cleland, Charles M.; Pham, Yen; Truong, Nga; Kapur, Reet; Alvarez, Gloria Guevara; Phan, Phuong Thu; Armstrong-Hough, Mari; Shelley, Donna (PLoS ONE, 2024)