Published on in Vol 17 , No 2 (2015) :February

1 Robert Wood Johnson Foundation Clinical Scholars Program , University of Pennsylvania , Philadelphia , PA , US
2 Penn Medicine Social Media and Health Innovation Lab , University of Pennsylvania , Philadelphia , PA , US
3 Leonard Davis Institute of Health Economics , University of Pennsylvania , Philadelphia , PA , US
4 Computer & Information Science Department and Positive Psychology Center , University of Pennsylvania , Philadelphia , PA , US
5 The Wharton School , University of Pennsylvania , Philadelphia , PA , US
6 National Bureau of Economic Research , Cambridge , MA , US
7 Penn Law School , University of Pennsylvania , Philadelphia , PA , US
8 Department of Emergency Medicine , University of Pennsylvania , Philadelphia , PA , US