Comparison of anxiety and depressive symptoms of head and neck cancer patients in a closed-loop management system before and during the 2019 coronavirus pandemic: a comparative study - Liu, Jiani; Yu, Lingling; Qiu, Ting; Luo, Yuanling; Fang, Xiaojuan; Yang, Fang; Xu, Xiwei; Zeng, Qi (Annals of Palliative Medicine, 2022)