Emmanuel O. D. Addo-Yobo et al. “Exercise-induced Bronchospasm and Atopy in Ghana: Two Surveys Ten Years Apart”. PLoS Medicine 4, № 2 (2007). См. также результаты последних исследований ISAAC: Heather J. Zar et al. “The Changing Prevalence of Asthma, Allergic Rhinitis and Atopic Eczema in African Adolescents from 1995 to 2002”. Pediatric Allergy and Immunology 18, № 7 (2007).