Cooper, PJ; Chico, ME; Vaca, MG; Rodriguez, A; Alcantara-Neves, NM; Genser, B; de Carvalho, LP; Stein, RT; Cruz, AA; Rodrigues, LC; +1 more... Barreto, ML; (2006) Risk factors for asthma and allergy associated with urban migration: background and methodology of a cross-sectional study in Afro-Ecuadorian school children in Northeastern Ecuador (Esmeraldas-SCAALA Study). BMC pulmonary medicine, 6. p. 24. ISSN 1471-2466 DOI: https://doi.org/10.1186/1471-2466-6-24