Wendt J, Schmidt MF, König J, Patzlaff R, Huss M, Urschitz MS (2018) Young age at school entry and the evolvement of attention-deficit hyperactivity disorder-related symptoms during primary school. Results of a prospective cohort study. BMJ Open;8:e 0200820. dx.doi.org/10.1136/bmjopen-2017-020820
Diefenbach, C., Schmidt, M. F., König, J., Patzlaff, R., & Urschitz, M. S. (2018). Psychometric evaluation of the preschool health examination at German Steiner schools. Results of IPSUM, a multicenter cross-sectional validation study. Research on Steiner Education, 9(2), 44-61.