1. Department of Palliative Care and Rehabilitation Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas.
2. Department of Palliative Care, Centre Hospitalier de Lyon-Sud, Hospices Civils de Lyon, Lyon, France.
3. Department of Family Medicine, Myong Ji Hospital, Kwandong University, College of Medicine, Gyeonggi, Republic of Korea.
4. Department of Internal Medicine, Institute of Health Science, College of Medicine, Gyeongsang National University Jinju, Republic of Korea.