1 Department of Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America.
2 School of Industrial Engineering, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile; Department of Emergency Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland.
3 Department of Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America. Electronic address: kpage2@jhmi.edu.