[1] Univ Salerno, Dept Math, I-84084 Fisciano, Italy
[2] Iuliu Hatieganu Univ Med & Pharm, Dept Clin Imaging Ultrasound, Cluj Napoca, Romania
[3] Zhejiang Univ Technol, Coll Comp Sci & Technol, Hangzhou 310023, Zhejiang, Peoples R China
[4] Iuliu Hatieganu Univ Med & Pharm, Dept Histol, Cluj Napoca, Romania