R. Klaassen

发表

Development of a stage-dependent prognostic model to predict psychosis in ultra-high-risk patients seeking treatment for co-morbid psychiatric disorders

F. Smit, W. Veling, M. Gaag, 2016, Psychological Medicine.

BASELINE DIFFERENCES IN CLINICAL SYMPTOMATOLOGY BETWEEN ULTRA HIGH RISK SUBJECTS WITH AND WITHOUT A TRANSITION TO PSYCHOSIS

D. Linszen, D. Nieman, L. Haan, 2010, Schizophrenia Research.

Factor Analysis of the Scale of Prodromal Symptoms: Differentiating between Negative and Depression Symptoms

D. Linszen, L. de Haan, D. Nieman, 2011, Psychopathology.

Baseline differences in clinical symptomatology between ultra high risk subjects with and without a transition to psychosis

D. Linszen, D. Nieman, L. Haan, 2009, Schizophrenia Research.

Positive symptoms in at‐risk mental state: the importance of differentiating within the scope

M. Gaag, R. Klaassen, S. Amstel, 2013, Early intervention in psychiatry.

Prevalence of psychopathology in children of parents with mental illness and/or addiction: an up to date narrative review

T. van Amelsvoort, A. Popma, K. V. van Doesum, 2017, Current opinion in psychiatry.

Cost-effectiveness of preventing first-episode psychosis in ultra-high-risk subjects: multi-centre randomized controlled trial

F. Smit, W. Veling, M. Gaag, 2014, Psychological Medicine.

A single blind randomized controlled trial of cognitive behavioural therapy in a help-seeking population with an At Risk Mental State for psychosis: the Dutch Early Detection and Intervention Evaluation (EDIE-NL) trial

P. Cuijpers, D. Linszen, D. Nieman, 2010, Trials.

The validity of the 16-item version of the Prodromal Questionnaire (PQ-16) to screen for ultra high risk of developing psychosis in the general help-seeking population.

W. Veling, D. Linszen, D. Nieman, 2012, Schizophrenia bulletin.

The distribution of self-reported psychotic-like experiences in non-psychotic help-seeking mental health patients in the general population; a factor mixture analysis

P. Cuijpers, P. Delespaul, D. Ståhl, 2014, Social Psychiatry and Psychiatric Epidemiology.

UvA-DARE ( Digital Academic Repository ) Emerging symptoms on the pathway to psychosis

R. Klaassen, Curriculum Vitae, 2013 .

Chapter 7 Detecting patients at high risk of developing psychosis : the usual suspects and beyond

P. Cuijpers, M. Gaag, D. Linszen, 2012 .

Four-Year Follow-up of Cognitive Behavioral Therapy in Persons at Ultra-High Risk for Developing Psychosis: The Dutch Early Detection Intervention Evaluation (EDIE-NL) Trial.

F. Smit, W. Veling, D. Linszen, 2016, Schizophrenia bulletin.

Cognitive behavioral therapy for subjects at ultrahigh risk for developing psychosis: a randomized controlled clinical trial.

P. Cuijpers, D. Linszen, D. Nieman, 2012, Schizophrenia bulletin.

Duration of untreated psychosis and negative symptoms — A systematic review and meta-analysis of individual patient data

D. Wiersma, L. Haan, R. Klaassen, 2012, Schizophrenia Research.

Depression and social anxiety in help-seeking patients with an ultra-high risk for developing psychosis

P. Cuijpers, M. Gaag, D. Linszen, 2013, Psychiatry Research.

Psychometric properties of the self-report version of the Quick Inventory of Depressive Symptoms (QIDS-SR16) questionnaire in patients with schizophrenia

K. Taxis, J. Wigman, R. Klaassen, 2014, BMC Psychiatry.

Ethnicity and baseline symptomatology in patients with an At Risk Mental State for psychosis

W. Veling, M. Gaag, D. Linszen, 2011, Psychological Medicine.

Who is @ease? Visitors’ characteristics and working method of professionally supported peer‐to‐peer youth walk‐in centres, anonymous and free of charge

T. van Amelsvoort, A. Popma, R. Klaassen, 2022, Early intervention in psychiatry.

COMT Val158Met genotype and cannabis use in people with an At Risk Mental State for psychosis: Exploring Gene x Environment interactions

M. Gaag, D. Linszen, D. Nieman, 2016, Schizophrenia Research.

Barriers and facilitators on the pathway to mental health care among 12-25 year olds

T. van Amelsvoort, A. Popma, R. Klaassen, 2021, International journal of qualitative studies on health and well-being.

The effect of childhood adversity on 4-year outcome in individuals at ultra high risk for psychosis in the Dutch Early Detection Intervention Evaluation (EDIE-NL) Trial

F. Smit, W. Veling, M. Gaag, 2017, Psychiatry Research.

Burden of mental health problems: quality of life and cost-of-illness in youth consulting Dutch walk-in youth health centres

T. van Amelsvoort, A. Popma, S. Evers, 2020, Journal of mental health.

Home alone: Social functioning as a transdiagnostic marker of mental health in youth, exploring retrospective and daily life measurements.

T. van Amelsvoort, A. Popma, I. Myin-Germeys, 2022, Comprehensive psychiatry.

Four-Year Cost-effectiveness of Cognitive Behavior Therapy for Preventing First-episode Psychosis: The Dutch Early Detection Intervention Evaluation (EDIE-NL) Trial

F. Smit, W. Veling, D. Linszen, 2016, Schizophrenia bulletin.

Three‐year course of clinical symptomatology in young people at ultra high risk for transition to psychosis

D. Nieman, R. Klaassen, H. Becker, 2011, Acta psychiatrica Scandinavica.

Depressive symptoms are associated with (sub)clinical psychotic symptoms in patients with non-affective psychotic disorder, siblings and healthy controls

M. van der Gaag, R. Klaassen, N. V. van Beveren, 2012, Psychological Medicine.

University of Groningen Duration of untreated psychosis and negative symptoms-A systematic review and meta- analysis of individual patient data

D. Wiersma, L. Haan, R. Klaassen, 2012 .

University of Groningen Psychometric properties of the self-report version of the Quick Inventory of Depressive Symptoms ( QIDS-SR 16 ) questionnaire in patients with schizophrenia

K. Taxis, J. Wigman, R. Klaassen, 2014 .

P. Cuijpers, D. Linszen, D. Nieman, 2010, Trials.

COMT Val158Met genotype and cannabis use in people with an At Risk Mental State for psychosis: Exploring Gene x Environment interactions

M. Gaag, D. Linszen, D. Nieman, 2016, Schizophrenia Research.

The Prodromal Questionnaire: a case for IRT‐based adaptive testing of psychotic experiences?

M. Wichers, M. Gaag, D. Linszen, 2017, International journal of methods in psychiatric research.

The validity of the 16-item version of the Prodromal Questionnaire (PQ-16) to screen for ultra high risk of developing psychosis in the general help-seeking population.

W. Veling, D. Linszen, D. Nieman, 2012, Schizophrenia bulletin.

Emerging symptoms on the pathway to psychosis

Academisch Proefschrift, D. Nieman, R. Klaassen, 2013 .

Detection of people at risk of developing a first psychosis: comparison of two recruitment strategies

P. Cuijpers, M. Gaag, D. Linszen, 2012, Acta psychiatrica Scandinavica.

[Psychotic disorders: the need for staging].

B. Rutten, R. Klaassen, L. Wunderink, 2012, Tijdschrift voor psychiatrie.