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The 4 references without a DOI — listed, not checked
no DOI — not checkedDeutsche Arbeitsgemeinschaft für Pädiatrische Stoffwechselerkrankungen (1990) Diätetische Behandlung der Phenylketonurie. Monatsschr Kinderheilkd 136: 636
no DOI — not checkedFahrenberg J, Hampel R, Selg H (1983) Das Freiburger Persönlichkeits-Inventar (FPI-R), Verlag für Psychologie, Dr CH Hogrefe, Göttingen
no DOI — not checkedJäger R, Berbig E, Geisel B, Gosslar H, Hagen J, Liebich W, Schafheutle R (1973) Mannheimer Biographisches Inventar (MBI), Verlag für Psychologie, Dr HJ Hogrefe, Göttingen
no DOI — not checkedSeitz W, Rausche A (1992) Persönlichkeitsfragebogen für Kinder (PFK 9–14). Westermann-Verlag, Braunschweig
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