. 2018 Nov 22;2(2):e22. doi: 10.2196/formative.8822
©Esther Metting, Aaltje Jantine Schrage, Janwillem WH Kocks, Robbert Sanderman, Thys van der Molen. Originally published in JMIR Formative Research (http://formative.jmir.org), 22.11.2018.
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Figure 2.
Overview of the different codes. COPD: chronic obstructive pulmonary disease.