1. School of Mathematical Sciences, Capital Normal University, Beijing, People's Republic of China
2. School of Mathematics and Statistics, Liaoning University, Shenyang, People's Republic of China
3. Production, Operations, and Decision Sciences Area, XLRI–Xavier School of Management, Jamshedpur, Jharkhand, India
4. College of Science, Shenyang Agricultural University, Shenyang, People's Republic of China