title: There is no reverse hierarchy (letter commenting: J Clin Epidemiol. 2015;68(11):1251--1260.).
authors: Institute for Quality and Efficiency in Health Care (IQWiG), Im Mediapark 8, 50670 Köln, Germany. Electronic address: juergen.windeler@iqwig.de.
authors: Jürgen
authors: J
authors: Windeler