title: Lacking portability of therapeutic effects: the hierarchy of internal validity is insufficient-A response to Hans J. Trampisch.
authors.affiliation: Institute of Transcultural Health Studies, European University Viadrina, Grosse Scharrnstr. 59, D - 15230 Frankfurt (Oder), Germany. Electronic address: walach@europa-uni.de.
authors.forename: Harald
authors.initials: H
authors.lastname: Walach