Hiroko Kitamura, N. Terunuma, S. Kurosaki, K. Hata, A. Osato, B. Uchino, Y. Morimoto, H. Kasai, T. Murase, T. Higashi. (2009). A Cohort Study of Respiratory Symptom and Lung Function in Japanese Toner Manufacturing Workers; Over the First 3years