Corresponding Author

Elizabeth Selvin

Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA

Welch Center for Prevention, Epidemiology and Clinical Research, Johns Hopkins University, Baltimore, Maryland, USA

Correspondence

Elizabeth Selvin, Department of Epidemiology, Welch Center for Prevention, Epidemiology and Clinical Research and the Johns Hopkins Bloomberg School of Public Health, 2024 E Monument Street, Suite 2-639, Baltimore, MD 21287, USA.

Email: eselvin@jhu.edu