1. Department of Mathematics, University of Salerno, Via Ponte Don Melillo, 84084 Fisciano, Italy
2. Department of Clinical Imaging Ultrasound, “Iuliu Hatieganu” University of Medicine and Pharmacy, Cluj-Napoca, Romania
3. College of Computer Science and Technology, Zhejiang University of Technology, Hangzhou 310023, China
4. Department of Histology, “Iuliu Hatieganu” University of Medicine and Pharmacy, Cluj-Napoca, Romania