1 Laboratory of Primary Health Care, General Practice and Health Services Research, Department of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.
2 Centre for International and Intercultural Health, University of Bologna, 40126 Bologna, Italy. Electronic address: [email protected].
3 London School of Hygiene & Tropical Medicine, London, UK.
4 Centre for Primary Care and Public Health, Queen Mary University of London, London, UK.
5 School of Public Health, University of the Western Cape, Cape Town, South Africa.