MUC5B and hypersensitivity pneumonitis: Among the 117 ILD patients, IPF was the most common subtype (29.9%; MAF of MUC5B promoter polymorphism 27.1%), followed by connective tissue disease associated-ILD (23.1%; MAF 22.2%), hypersensitivity pneumonitis (13.7%; MAF 12.5%), sarcoidosis (9.4%; MAF 9.1%), lymphangioleiomyomatosis (5.1%; MAF 8.3%), iNSIP (4.2%; MAF 20.0%) and exposure-induced ILD (4.2%; MAF 20.0%).