Improving a newly developed patient-reported outcome for thyroid patients, using cognitive interviewing. - Watt, Torquil; Rasmussen, Åse; Groenvold, Mogens; Bjorner, Jakob; Watt, Sara; Bonnema, Steen; Hegedüs, Laszlo; Feldt-Rasmussen, Ulla (Quality of Life Research, 2008)