About the Authors

Sandra Larson

Affiliation College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan, United States of America

Germán Comina

Affiliation Laboratorio de Ingeniería Física, Facultad de Ciencias, Universidad Nacional de Ingeniería, Rimac, Lima, Perú

Robert H. Gilman

Affiliation Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Brian H. Tracey


Affiliation Department of Electrical and Computer Engineering, Tufts University, Medford, Massachusetts, United States of America

Marjory Bravard

Affiliation Department of Internal Medicine, Massachusetts General Hospital, Boston, Massachusetts, United States of America

José W. López

Affiliation Unidad de Epidemiología, Hospital Nacional Dos de Mayo, Lima, Perú

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MB RHG JL. Performed the experiments: MB JL SL. Analyzed the data: SL GC BT JL. Contributed reagents/materials/analysis tools: BT GC. Wrote the paper: SL BT GC MB RHG JL.