Standardized study performance, quality assurance, and quality control in a cluster-randomized trial: the Pneumococcal Vaccine Schedules trial by Isaac Osei, Benjamin Young, Golam Sarwar, Yekini A. Olatunji, Ilias Hossain, Babila G. Lobga, Baleng M. Wutor, Williams Adefila, Emmanuel Mendy, Banjo Adeshola, Yasir Shitu Isa, Yusuf A. Olawale, Keita M. Lamin, Ebrimah Nyimanta, Bubacarr Baldeh, Abdoullah Nyassi, Momodou M. Drammeh, Barjo Ousman, Minteh Molfa, Rasheed Salaudeen, Grant A. Mackenzie

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