1. Faculty of Pharmacy, Medical University-Pleven, 5800 Pleven, Bulgaria
2. Faculty of Public Health “Prof. Tsekomir Vodenicharov, MD, DSc”, Medical University of Sofia, 1527 Sofia, Bulgaria
3. Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
4. Center for Observational and Real-World Evidence, Merck & Co., Inc., Rahway, NJ 07065, USA
5. Center for Observational and Real-World Evidence, Merck Sharp & Dohme, 11330 Stockholm, Sweden
6. Market Access, MSD, 1407 Sofia, Bulgaria