Psychometric evaluation of the shortened version of the Functional Difficulties Questionnaire to assess thoracic physical function

Mohd Ali Katijjahbe, Linda Denehy, Catherine L Granger, Alistair Royse, Colin Royse, Sarah Logie, Tamica Sturgess, Nur Ayub Md Ali, Margaret McManus, Clarke-Errey Sandy, Doa El-Ansary