1 Erratum

In the original published version of this article [1], the authors’ affiliation address was incorrectly listed as follows:

  • College of Mathematics and Information Science, 46 East of Construction Road, Xinxiang 453007, Henan, P.R. China

The correct affiliation address for the authors is

  • College of Mathematics and Information Science, Henan Normal University, Xinxiang 453007, P.R. China