STABLE trial of spectacle provision and driving safety among myopic motorcycle users in Vietnam: study protocol for a stepped-wedge, cluster randomised trial by Vinh Chi Le, Kien Gia To, Van Dat Le, Le Nguyen, Graeme MacKenzie, Lovemore Nyasha Sigwadhi, Prabhath Piyasena, Mai Tran, Ving Fai Chan, Rohit C. Khanna, Mike Clarke, Lynne Lohfeld, Heather Dickey, Augusto Azuara-Blanco, Asha Latha Mettla, Sridevi Rayasam, Han Thi Ngoc Doan, Dung Van Do, Phuoc Hong Le, Charlie Klauer, Richard Hanowski, Zeb Bowden, Lynn Murphy, Joanne Thompson, Susan McMullan, Cliona McDowell, Raja Narayanan, Julie-Anne Little, Huong Thu Ha, Sangchul Yoon, Rahul Goel, Lan Luong, Xuan Nguyen, Nathan Congdon

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