Dimitar Ivanov Grupchev; Mladena Nikolaeva Radeva; Miglena Georgieva; Christina N. Grupcheva
DOI: 10.5935/0004-2749.20180030
Medical University of Varna, Varna, Bulgaria
Corresponding authorCN Grupcheva
Medical University of Varna
15 Doyran St., Varna
9002, Bulgaria
E-mail: [email protected]