Chronic respiratory disease observatory for Africa (CHEST-Africa): study protocol for the prevalence, determinants and economic impacts of asthma and COPD in Africa nork Andre F S Amaral, Kevin Mortimer, Marie Stolbrink, Tony Kayembe-Kitenge, Maia Lesosky, Refiloe Masekela, Rebecca Nantanda, Ana Mocumbi, Josue Mbonigaba, Jibril Mohammed, Lindsey Zurba, Obianuju B Ozoh, Abdoul Risgou Ouédraogo, Jean Pierre Sibomana, Nqobile Ndimande, Tochukwu Ayo-Olagunju, Suliaman Lakoh, Elizabete Nunes, Sandra Owusu

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