Walach, Harald; Fønnebø, Vinjar; Falkenberg, Torkel; Lewith, George; Jonas, Wayne B. (Journal article; Tidsskriftartikkel; Peer reviewed, 2006-06-24)
Background: The reasoning behind evaluating medical interventions is that a hierarchy of
methods exists which successively produce improved and therefore more rigorous evidence based
medicine upon which to make clinical decisions. At the foundation of this hierarchy are case studies,
retrospective and prospective case series, followed by cohort studies with historical and
concomitant non-randomized ...