Establishing construct validity for the thyroid-specific patient reported outcome measure (ThyPRO): an initial examination. - Watt, Torquil; Bjorner, Jakob; Groenvold, Mogens; Rasmussen, Åse; Bonnema, Steen; Hegedüs, Laszlo; Feldt-Rasmussen, Ulla (Quality of Life Research, 2009)