"multiple hospitals" is correct and usable in written English.
You can use it to refer to more than one hospital, for example, "The city has multiple hospitals to serve its residents."
(Hospital staff could be unaware if subjects visited multiple hospitals during the study period).
It ran in multiple hospitals and I also started teaching.
Further, patients may use multiple hospitals for their care.
He said victims were taken to multiple hospitals.
"I can tell you right now, it was multiple hospitals that they called," she said.
They like working at multiple hospitals," Mullen said.
Establishment of healthcare policy in South Korea provides patients' freedom to select and visit multiple hospitals.
Comprehensive, population-based surveillance for nonfatal injuries requires uniform methods for data collection from multiple hospitals.
Another good example is the project in northern Finland, where a collaboration platform can be used to carry out reporting between multiple hospitals [10].
This situation can be extended to more than two parties, e.g., a patient monitoring system provided to multiple hospitals which collaboratively provide care to the same patient.
She saw empty shelves in pharmacies in multiple hospitals.
