MADRID, SPAIN - 2013. JANUARY. 13: Thousands of workers and users of the health system in Madrid have marched this Sunday through the main streets of the capital in the so-called "Marea Blanca" in protest to defend the public nature of this service. This is the second demonstration of the year in protest at the plans to outsource health centers in the Community of Madrid. (Photo by Patricio Realpe/ChakanaNews)