1 Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA. Electronic address: lrubenstein@jhu.edu.
2 Johns Hopkins Hospital Department of Internal Medicine, Johns Hopkins University, Baltimore, MD 21205, USA.
3 Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA.
4 Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA; Johns Hopkins University School of Nursing, Johns Hopkins University, Baltimore, MD 21205, USA.