Addressing Limitations and Future Directions in Assessing Risk Factors for Pulmonary Complications after Femur Fracture Surgery in Elderly Patients [Response to Letter]

Jina Chai,1 Jiyeon Kang,1 Woo Jung Seo,1 Hyung Koo Kang,1 Hyeon-Kyung Koo,1 Hyoung-Keun Oh,2 Suk Kyu Choo,2 Jieun Kang1 1Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Gyeonggi-do, Republic of Korea; 2Department of Orthopedic Surgery, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Gyeonggi-do, Republic of KoreaCorrespondence: Jieun Kang, Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Ilsan Paik Hospital, Inje University College of Medicine, 170, Juhwa-ro, Ilsanseo-gu, Goyang, Gyeonggi-do, 10380, Republic of Korea, Tel +82-31-910-7695, Fax +82-31-910-7219, Email [email protected]