Kunming University of Science and Technology, Kunming University of Science and Technology, Kunming University of Science and Technology, Kunming University of Science and Technology, Kunming University of Science and Technology, affiliation not provided to SSRN, Kunming University of Science and Technology, Kunming University of Science and Technology, Kunming University of Science and Technology, Kunming University of Science and Technology, Kunming University of Science and Technology, Kunming University of Science and Technology and Kunming University of Science and Technology