Hebei Normal University of Science and Technology, Hebei Normal University of Science and Technology, Hebei Normal University of Science and Technology, Hebei Normal University of Science and Technology, Hebei Normal University of Science and Technology, Hebei Normal University of Science and Technology, Hebei Normal University of Science and Technology, Hebei Normal University of Science and Technology, Hebei Normal University of Science and Technology, Hebei Normal University of Science and Technology, Yanshan University, affiliation not provided to SSRN and Hebei Normal University of Science and Technology