AirForce:10.2105/AJPH.72.3.280
AirForce:10.2105/AJPH.82.6.897-a
AirForce:10.2105/AJPH.89.8.1228
AirForce:10.2105/AJPH.93.8.1230
AirForce:10.2105/AJPH.2008.155432
AirForce:10.2105/AJPH.2009.159871
AirForce:10.2105/AJPH.2009.175091
AirForce:10.2105/AJPH.2011.300580