Published on in Vol 7 , No 7 (2018) :July

1 Department of Statistics , Harvard University , Cambridge , MA , US
2 Department of Psychiatry and Addiction Center , University of Michigan , Ann Arbor , MI , US
3 School of Public Health , University of Michigan , Ann Arbor , MI , US
4 Department of Emergency Medicine , University of Michigan Medical School , Ann Arbor , MI , US
5 Injury Prevention Center , University of Michigan , Ann Arbor , MI , US
6 Institute for Social Research , University of Michigan , Ann Arbor , MI , US
7 School of Information , University of Michigan , Ann Arbor , MI , US