RT Article T1 Coping with threats to the validity of meta-analytic findings: a reanalysis of german-language psychotherapy outcome studies JF Social prevention and the social sciences SP 333 OP 352 A1 Matt, Georg E. LA English YR 1991 UL https://krimdok.uni-tuebingen.de/Record/1526068230 SN 3110123878 K1 Psychotherapieforschung K1 Metaanalyse