Olive R. Cawiding†, Hyeontae Jo†, Saebom Jeon, Faeyza Rishad Ardi, Jae Kyoung Kim*, Seockhoon Chung*, Cancer-related Dysfunctional Beliefs and Attitude about Sleep-6 (C-DBAS-6): A practical and accurate shortened version using XGBoost and SymScore, Sleep and Biological Rythms