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. 2019 Feb 13;10(Suppl 1):1–13. doi: 10.1007/s13300-019-0573-y

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© The Author(s) 2019

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — The continuum of clinical research [54]. RCT randomised controlled trial

Adapted with permission from Saturni, S., F. Bellini, F. Braido, et al. Randomized Controlled Trials and real life studies. Approaches and methodologies: a clinical point of view. Pulm Pharmacol Ther. 2014;27:129–38. [54]