Tonko Hoffman

Collaborative mental health care versus care as usual in a primary care setting: a randomized controlled trial.

P. Spinhoven, T. Hoffman, E. Hoencamp, 2009, Psychiatric services.

The five-factor model of the Positive and Negative Syndrome Scale II: A ten-fold cross-validation of a revised model

Mark van der Gaag, Durk Wiersma, Lucia Valmaggia, 2006, Schizophrenia Research.

The five-factor model of the Positive and Negative Syndrome Scale I: Confirmatory factor analysis fails to confirm 25 published five-factor solutions

Mark van der Gaag, Durk Wiersma, Lucia Valmaggia, 2006, Schizophrenia Research.