Systematic identification and stratification of help-seeking school-aged youth with mental health problems: a novel approach to stage-based stepped-care. - Wolf RT; Puggaard LB; Pedersen MMA; Pagsberg AK; Silverman WK; Correll CU; Plessen KJ; Neumer SP; Gyrd-Hansen D; Thastum M; Bilenberg N; Thomsen PH; et al. (European child & adolescent psychiatry, 2022)