[1] Harvard Univ, Sch Med, Dept Global Hlth & Social Med, Boston, MA 02115 USA
[2] Harvard Univ, Dept Hist Sci, Cambridge, MA 02138 USA
[3] Johns Hopkins Univ, Sch Med, Div Gen Internal Med, Baltimore, MD USA
[4] Johns Hopkins Univ, Sch Med, Dept Hist Med, Baltimore, MD USA