1). Define PPO, POS, and the four types of HMOs. 2). Explain how


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1). Define PPO, POS, and the four types of HMOs. 2). Explain how gatekeeping reduces healthcare costs in the U.S. 3). Describe the four aspects of holistic healthcare for the elderly. No more than 2 pages. References are needed. This is in the Health Science field, not Biology.

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