1. School of Public Health, Imperial College London; Global eHealth Unit, Department of Primary Care and Public Health; London UK
2. University of Split; Prolaz Ivana Lozice 4 Split Croatia 21000
3. Imperial College London; Library Services; Central Library, Imperial College London South Kensington Campus London UK SW7 2AZ
4. Stetson University; Integrative Health Science; 421 N Woodland Blvd Unit 8317 DeLand Florida USA 32723
5. Imperial College London; Global eHealth Unit, Department of Primary Care and Public Health, School of Public Health; Reynolds Building St Dunstans Road London UK W6 8RP
6. University of Ljubljana; Department of Family Medicine, Faculty of Medicine; Ljubljana Slovenia