Only a dozen or so Massachusetts hospitals have adopted communication, apology and resolution to guide their interactions with patients and families following a medical error, and these programs have been even slower to catch on at ambulatory practices.

That’s why it was noteworthy when Atrius Health, the state’s largest ambulatory network, set out last year to provide formal support for the system to its 750 physicians.

“We’ve seen about 30 cases go through since then —

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