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)
© Cooper et al; licensee BioMed Central Ltd. 2006
Received: 18 August 2006
Accepted: 13 September 2006
Published: 13 September 2006
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