Reply to: Pirfenidone and lung cancer in idiopathic pulmonary fibrosis: mind the index date, detection bias and competing risks

Affiliations

• ¹ Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Soonchunhyang University Seoul Hospital, Seoul, Republic of Korea.
• ² Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea jwsongasan@gmail.com.