1. Faculty of Medicine, University of Medicine , Rr. ‘Dibres’, No. 371, Tirana 1000 , Albania
2. Department of Noncommunicable Diseases, Institute of Public Health , Tirana , Albania
3. Imperial Clinical Trials Unit, Imperial College London , London , UK
4. Department of Primary Care and Public Health, Imperial College London , London , UK
5. Department of International Health, CAPHRI (Care and Public Health Research Institute), Duboisdoman 30, 6229 GT, Maastricht University , Maastricht , The Netherlands