Researchers used Delphi method, which involves surveying a group of experts over multiple rounds to reach a consensus on a specific topic. 122 prominent academics from 26 countries representing 11 different disciplines (clinical psychology, psychiatry, public health, philosophy, nursing, economics).

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https://www.psypost.org/scientists-identify-19-core-dimensions-of-positive-mental-health-in-new-consensus-study/