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On one extreme, there may be no overlap between individuals who had CIV-provider claim and those who had MIL-provider claims. On the other extreme, there could be complete overlap. Because the MIL group was approximately 2-fold larger than CIV, it is possible that all the CIV group had exposure to CIV and MIL providers and were also part of the MIL group. CIV = civilian, MIL = military.
