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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)

Philip J Cooper*, Martha E Chico, Maritza G Vaca, Alejandro Rodriguez, Neuza M Alcântara-Neves, Bernd Genser, Lain Pontes de Carvalho, Renato T Stein, Alvaro A Cruz, Laura C Rodrigues and Mauricio L Barreto

BMC Pulmonary Medicine 2006, 6:24  doi:10.1186/1471-2466-6-24

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