Levels of participation in the Psoriatic Arthritis Impact of Disease (PsAID) development process. Levels of participation in the Psoriatic Arthritis Impact of Disease (PsAID) development process. Reproduced from: Teunissen, T. Values and criteria of people with a chronic illness or disability. Strengthening the voice of their representatives in the health debate and the decision making process [dissertation]. Amsterdam: VU University; 2014. M P T de Wit et al. RMD Open 2015;1:e000129 Copyright © BMJ Publishing Group & EULAR. All rights reserved.