G. Postema, Sietke K. van der Sluis, Corry Waldenlöv, Kristina M. Norling Hermansson, Liselotte Demographics of patients and controls. *<p>Prosthesis use: full-time = more than 8 hours a day, 7 days a week; non-full-time = never to a maximum of 4–8 hours a day, 5–7 days a week.</p><p>NA = Not applicable.</p> patients 2013-02-19
    https://plos.figshare.com/articles/dataset/_Demographics_of_patients_and_controls_/203327
10.1371/journal.pone.0049727.t002