Author/Authors :
DIMOVA ، Rositsa - Medical University Plovdiv , STOYANOVA ، Rumyana - Medical University Plovdiv , HARIZANOVA ، Stanislava - Medical University Plovdiv , TARNOVSKA ، Miglena - Medical University Plovdiv , KESKINOVA ، Donka - University of Plovdiv Paisii Hilendarski
