Predictors of problems reported on the EQ-5D-3L dimensions among people with impaired vision in northern Portugal oleh Antonio Filipe Macedo, Amanda Hellström, Robert Massof, Hanna Tuvesson, Mikael Rask, Pedro Lima Ramos, Jalal Safipour, Ina Marteinsdottir, Evalill Nilsson, Cecilia Fagerström, Kristofer Årestedt