Are prescribing doctors sensitive to the price that their patients have to pay in the Spanish National Health System?

Are prescribing doctors sensitive to the price that their patients have to pay in the Spanish National Health System?
B. González López-Valcárcel, J. Librero; G. Sanfélix-Gimeno; S. Peiró. BMC Health Services Research, 2011.   Fulltext   Abstract
Journal article