There is no hierarchy in the first place-a comment on Jürgen Windeler.
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[1] Harald Walach,et al. Using a matrix-analytical approach to synthesizing evidence solved incompatibility problem in the hierarchy of evidence. , 2015, Journal of clinical epidemiology.
[2] Jürgen Windeler. There is no reverse hierarchy (letter commenting: J Clin Epidemiol. 2015;68(11):1251--1260.). , 2016, Journal of clinical epidemiology.