Association between brain iron deposition and pure apathy in Parkinson’s disease: a cross-sectional quantitative susceptibility mapping imaging study - Zhang, Li; Chen, Kaidong; Zhi, Yan; Ji, Wei; Shi, Guofeng; You, Yiping; Wang, Feng; Chen, Kefei; Xu, Tian; Fang, Xiangming (Quantitative Imaging in Medicine and Surgery; Vol 15, No 9 (September 01, 2025): Quantitative Imaging in Medicine and Surgery, 2025)