1. Department of Industrial and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
2. Transportation Research Institute, University of Michigan, Ann Arbor, MI, USA
3. Department of Industrial and Operations Engineering, University of Michigan, Ann Arbor, MI, USA
4. Grado Department of Industrial and Systems Engineering, Virginia Tech, Blacksburg, VA, USA
5. Department of Industrial Engineering, Institute for Quality and Reliability, Tsinghua University, Beijing, China