Nurses participate in a one day strike at a hospital in Burlingame, Calif. on December 22, 2011. The strike affects 2,000 RNs at Long Beach Memorial Medical Center and Miller Children's Hospital in Long Beach, and 4,000 RNs who work at nine Bay Area facilities that are part of the Sutter Health Corporation. The nurses are protesting what they call unsafe nurse-to-patient staffing ratios and increases in their health care premiums.