Impact of the COVID-19 pandemic on a clinical trial of pneumococcal vaccine scheduling (PVS) in rural Gambia oleh Ilias Hossain, Isaac Osei, Galega Lobga, Baleng M. Wutor, Yekini Olatunji, Williams Adefila, Banjo Adeshola, Yasir Isa, Cattram Nguyen, Kemo Sonko, Lamin Ceesay, Bubacarr Baldeh, Omar Barrow, Benjamin Young, Saidina Ceesay, Abdoullah Nyassi, Golam Sarwar, Ousman Barjo, Momodou M.Drammeh, Rasheed Salaudeen, Grant Mackenzie