RecruitingEmotional and Social Experiences of Antifibrotic (AF) Therapy Among Idiopathic Pulmonary Fibrosis (IPF)/Progressive Pulmonary Fibrosis (PPF) Patients: A Real-World StudyThis is a cross-sectional study that will be conducted across Japan using an online patient-reported outcome questionnaire. This study tries to find out the attitudes toward and experiences of the emotional and/or social impact of side effects associated with antifibrotic (AF) treatment among Japanese patients with Idiopathic Pulmonary Fibrosis (IPF)/Progressive Pulmonary Fibrosis (PPF), and how are these attitudes associated with patients' individual characteristics.