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An AHA survey shows overall growth in shared services from 1975 to 1978 and participation according to type of hospital, bed-size category, type of service, and other specifics.

美国心脏协会（AHA）的一项调查显示了1975年至1978年共享服务的总体增长情况，以及按医院类型、床位规模类别、服务类型和其他具体情况划分的参与情况。

An AHA survey shows overall growth in shared services from 1975 to 1978 and participation according to type of hospital, bed-size category, type of service, and other specifics.