- Developmental profiles on the basis of the FTF (Five to Fifteen) questionnaire-clinical validity and utility of the FTF in a child psychiatric sample. Trillingsgaard, A., Damm, D., Sommer, S., Jepsen, J.R., Ostergaard, O., Frydenberg, M., Thomsen, P.H. European child & adolescent psychiatry. (2004)









