Hussain, Mehmood, et al. “Efficacy of I-131 MIBG Myocardial Scintigraphy for the Differentiation Between Parkinson’s Disease and Multiple System Atrophy”. Pakistan Armed Forces Medical Journal, vol. 74, no. 6, Dec. 2024, pp. 1513-7, https://doi.org/10.51253/pafmj.v74i6.8384.