1. Validity of oral fluid test for Delta-9-tetrahydrocannabinol in drivers using the 2013 National Roadside Survey Data Jin, Huiyan; Williams, Sharifa Z.; Chihuri, Stanford T.; Li, Guohua; Chen, Qixuan 2018 Articles MarijuanaDrug testingDrugged drivingTetrahydrocannabinolEpidemiology
2. Timing and effect of a safe routes to school program on child pedestrian injury risk during school travel hours: Bayesian changepoint and difference-in-differences analysis DiMaggio, Charles J.; Chen, Qixuan; Muennig, Peter A.; Li, Guohua 2014 Articles Public healthEpidemiology
3. Interaction of marijuana and alcohol on fatal motor vehicle crash risk: a case–control study Chihuri, Stanford T.; Li, Guohua; Chen, Qixuan 2017 Articles Traffic accidentsDrinking and traffic accidentsMarijuanaDrug interactionsTraffic fatalities