Retrospective study at a single center.

在一所单中心行回顾性研究。

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SETTINGS & PARTICIPANTS: 515 patients on maintenance hemodialysis therapy at a single center.

环境与受试者：单中心515例行持续血液透析患者。

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Endoscopic ultrasound rendezvous for bile duct access using a transduodenal approach: cumulative experience at a single center.

经十二指肠途径的超声内镜交换技术进行胆道插管：单中心的累积经验。

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Inevitably, considerable redundancy and additional costs will be entailed as the several services are obliged to perform work heretofore done by a single center.

CENTERFORSECURITYPOLICY: Center for Security Policy | Will China��s Nuclear Test Precipitate Needed Reexamination Of Clinton, Congressional Policies?

He retired his first 10 batters, striking out five, before Murphy lined a single to center.

WSJ: Marlins lose to Mets, waste Fernandez's fine debut

He was New York's only runner until Robinson Cano grounded a single to center leading off the seventh.

WSJ: Alex Cobb leads Rays over Yankees and Sabathia 8-3