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Source adds the following: 
This OneKey extract includes three distinct ownership types: 
Owned by integrated delivery network (IDN)

• In this study, “hospital-owned” practices are those classified as IDNowned
• To be classified as an IDN, a parent organization must include at least one acute care hospital and at least one non-acute entity (e.g., clinic, rehabilitation facility)
• Likewise, “hospital-employed” physicians are physicians in the OneKey database indicated as employed by an IDN-owned practice

Owned by other corporate entity

• Other corporate entities are parent organizations not classified as IDNs
• These corporate entities include health insurers, private equity firms, umbrella corporate entities that own multiple physician practices, etc.

Practices without any external parent corporate organization as an owner are considered independent