Eleven sets of twins were born in Avis Medica Clinic in the North-Western Bulgarian City of Pleven in 2017, the hospital said on 4 th of January. In 2017, the newborns in Avis Medica are 581: 303 boys; 267 girls and 11 sets of twins. The last baby of 2017 is a girl, born on 30 th of...