Design and rationale of the Botswana Smoking Abstinence Reinforcement Trial: a protocol for a stepped-wedge cluster randomized trial oleh Florence Bada, Megan E. Mansfield, Lillian Okui, Milton Montebatsi, Carlo DiClemente, Roy Tapera, Kaizer Ikgopoleng, Selebaleng Mokonopi, Jessica F. Magidson, Eberechukwu Onukwugha, Ndwapi Ndwapi, Seth Himelhoch, Bontle Mbongwe, Man Charurat