1. Trading economics, available at: http://www.tradingeconomics.com/netherlands/international-touristm-number-of-departures-wb-data.html [accessed 29.12.13].
2. UNTWO, World Tourism Organization, available at: http://www2.unwto.org [accessed 29.12.13].
3. Vaccine preventable diseases in returned international travelers: results from the GeoSentinel Surveillance Network;Boggild;Vaccine,2010
4. National guidelines for vaccination and malaria prophylaxis for travellers;LCR, National Coordination Centre for Traveller’s Health,2013
5. STROBE statement, available at: www.strobe-statement.org [accessed 29.12.13].