B. Walsh, M. Silles, and C. O'Neill. Health Policy, 101 (3):
269-276(2011)First published online: March 21, 2011. http://dx.doi.org/10.1016/j.healthpol.2011.02.001. (Eurobarometer).
S. Koos. Journal of Consumer Policy, 34 (1):
127-151(2011)First published online: January 18, 2011, http://dx.doi.org/10.1007/s10603-010-9153-2. (Eurobarometer).