?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Fokkema&rft.au=Fokkema%2C+M&rft.aufirst=M&rft.issn=1468-4381&rft.atitle=Generalized+linear+mixed-model+(GLMM)+trees%3A+A+flexible+decision-tree+method+for+multilevel+and+longitudinal+data&rft.title=Psychotherapy+Research&rft.date=30+June+2020&rft.pages=1-13&rft.genre=article