**Author details**

Penka A. Atanassova and Nedka T. Chalakova *Department of Neurology; Medical University, Plovdiv, Bulgaria* 

	- Borislav D. Dimitrov

*Department of General Practice, Division of Population Health Sciences, Royal College of Surgeons in Ireland, Dublin, Republic of Ireland* 

*Academic Unit of Primary Care and Population Sciences, University of Southampton, Southampton, United Kingdom* 
