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)
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* Corresponding author: Philip J Cooper pcooper@ecnet.ec
BMC Pulmonary Medicine 2006, 6:24 doi:10.1186/1471-2466-6-24
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