Association between Cumulative Dose of Brick Dust with Serum Levels of Interleukin-4 and Lung Function Among Brick Makers in Badung, Bali Made Nian Anggara, Ida Bagus Ngurah Rai, Ni Luh Putu Eka Arisanti*, Pande Made Andikayasa, Ida Ayu Jasminarti Dwi Kusumawardani, Ni Wayan Candrawati, and Putu Andrika Abstract Background: Brickmakers