The prevalence of helmet use in motorcyclists around the world: a systematic review and meta-analysis of 5,006,476 participants von Shool, Sina, Piri, Seyed Mohammad, Ghodsi, Zahra, Tabrizi, Reza, Amirzade-Iranaq, Mohammad Hosein, Mashayekhi, Mahdieh, Ohadi, Mohammad Amin Dabbagh, Mojtabavi, Kurosh, Abbasnezhad, Reyhane, Vasighi, Kasra, Atlasi, Rasha, Ansari-Moghaddam, Alireza, Heydari, Seyed Taghi, Sharif-Alhoseini, Mahdi, Shafieian, Mehdi, O’Reilly, Gerard, Rahimi-Movaghar, Vafa

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