Dimitrova-Karamfilova, Antoaneta
Tzveova, Reni
Chilingirova, Nezabravka
Goranova, Teodora
Nachev, Gencho
Mitev, Vanio
Kaneva, Radka
Funding for this research was provided by:
Science Fund, Medical University-Sofia (No.18-D/ 2012)
National Science Fund, Ministry of Education and Science of Bulgaria (DUNK01-2/2009)