Using behaviour change theory to train health workers on tobacco cessation support for tuberculosis patients: a mixed-methods study in Bangladesh, Nepal and Pakistan oleh Sahil Warsi, Helen Elsey, Melanie Boeckmann, Maryam Noor, Amina Khan, Deepa Barua, Shammi Nasreen, Samina Huque, Rumana Huque, Sudeepa Khanal, Prabin Shrestha, James Newell, Omara Dogar, Kamran Siddiqi, The TB & Tobacco consortium