Variations in physician practice and covert rationing.
D003363:Cost Control; D004465:Economic Competition; D035082:Federal Government; D033161:Government Regulation; D006278:Medicare / Q000191:economics; D018579:Patient Selection; D010818:Practice Patterns, Physicians' / Q000191:economics*; D011445:Prospective Payment System / Q000191:economics; D040841:Resource Allocation; D014481:United States; D035862:Vulnerable Populations