Milena Atanasova,

MedicalUniversity – Pleven, 1 Sv. Kliment Ohridski Str.; 5800 Pleven; Bulgaria;

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Ivelina Yordanova

MedicalUniversity – Pleven, 1 Sv. Kliment Ohridski Str.; 5800 Pleven; Bulgaria;

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Nadia Veleva

MedicalUniversity – Pleven, 1 Sv. Kliment Ohridski Str.; 5800 Pleven; Bulgaria;

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Angel Yordanov

MedicalUniversity – Pleven, 1 Sv. Kliment Ohridski Str.; 5800 Pleven; Bulgaria;

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