1. Department of Systems Leadership and Effective Science, University of Michigan, Ann Arbor, MI 48109, USA
2. Institute for Quantitative Biology, East Tennessee State University, Johnson City, TN 37614, USA
3. Department of Health Economics and Center for Health System Research, Hanoi Medical University, Hanoi, Vietnam
4. Institute for Preventive Medicine and Public Health, Hanoi Medical University, Hanoi, Vietnam
5. Department of Mathematics and Statistics, East Tennessee State University, Johnson City, TN 37614, USA
6. Department of Pharmaceutical Practice, East Tennessee State University, Johnson City, TN 37614, USA