Outdoor air pollution from industrial chemicals causing new onset of asthma or COPD: a systematic review protocol oleh Harald Lux, Xaver Baur, Lygia Therese Budnik, Astrid Heutelbeck, João Paulo Teixeira, Emeri Neumann, Diana Adliene, Judita Puišo, David Lucas, Jakob Löndahl, Athanasios Damialis, Ozlem Goksel, Hans Orru