| pneumonia case-finding in the respire guatemala indoor air pollution trial: standardizing methods for resource-poor settings. | trials of environmental risk factors and acute lower respiratory infections (alri) face a double challenge: implementing sufficiently sensitive and specific outcome assessments, and blinding. we evaluate methods used in the first randomized exposure study of pollution indoors and respiratory effects (respire): a controlled trial testing the impact of reduced indoor air pollution on alri, conducted among children <or= 18 months in rural guatemala. | 2007 | 17768502 |