Quantitative iron–neuromelanin MRI associates with motor severity in Parkinson's disease and matches radiological disease classification oleh Septian Hartono, Septian Hartono, Robert Chun Chen, Robert Chun Chen, Thomas Welton, Thomas Welton, An Sen Tan, Weiling Lee, Peik Yen Teh, Celeste Chen, Wenlu Hou, Wei Ping Tham, Ee Wei Lim, Kumar M. Prakash, Yao-Chia Shih, Yao-Chia Shih, Kuan Jin Lee, Louis C. S. Tan, Louis C. S. Tan, Eng King Tan, Eng King Tan, Ling Ling Chan, Ling Ling Chan