What is the test for wrongful suspension of privileges after a peer review proceeding?

Rather than broadly applying the proceeding-reviewable-by-mandate privilege to all claims alleging a wrongful suspension of privileges after a peer review proceeding, we conclude that such claims should be reviewed on a case-by-case basis under the test that determines whether the gravamen of the action was communicative. (Rusheen v. Cohen, supra, 37 Cal.4th at p. 1058.) Under this test, the key inquiry is "whether the injury allegedly resulted from an act that was communicative in its essential nature." (Ibid.)