Detecting chronic obstructive pulmonary disease using peak flow rate: cross sectional survey.

We thank all the Médecins Sans Frontières coordination and field teams involved for their help, particularly Fazil Tefera and Sandrina Simons. We acknowledge the invaluable assistance of many Angolan translators, and thank local authorities for their support and hospitality. Contributors: See bmj.com Funding: The study was financed entirely by Médecins Sans Frontières. Competing interests: None declared. Ethical approval: This study was not reviewed by an ethics committee. Field surveys of mortality in the context of humanitarian emergencies do not go through an institutional review board, and WHO guidelines on mortality assessments do not require an ethical review.