Tobacco retail characteristics across urban and rural districts in Lao PDR: an observational study, 2024. - Kulkarni S; Bui TC; Xangsayarath P; Phangdouangsy K; Soulaphy C; Sengdara K; Martinez SA; Janitz A; Frank-Pearce SG; Beebe LA (Frontiers in public health, 2026)