老年人需要留意哪些医生在保险网络内，以及他们可能面临哪些额外收费。
Seniors need to pay attention to who is in network and what added charges they may face.
华尔街日报
买家当心：新的联邦医疗保险计划福利更少、费用更高Buyer Beware: New Medicare Plans Have Fewer Benefits, Higher Costs
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