The cross-cultural validation of the English version of RhinAsthma patient's perspective (RAPP).

No validated instrument is currently available in English for use in daily practice to assess Health Related Quality of Life (HRQoL) in asthma and comorbid allergic rhinitis (AR). The aim of this study was to validate and assess the psychometric characteristics of an English language version of RhinAsthma Patient Perspective (RAPP).: The study was performed in the Philippines.