R. B. Postuma, D. Berg, and M. Stern, MDS clinical diagnostic criteria for Parkinson's disease, Mov Disord Off J Mov Disord Soc, vol.30, pp.1591-1601, 2015.

A. J. Hughes, S. E. Daniel, L. Kilford, and A. J. Lees, Accuracy of clinical diagnosis of idiopathic Parkinson's disease: a clinicopathological study of 100 cases, J Neurol Neurosurg Psychiatry, vol.55, pp.181-184, 1992.

S. Gilman, G. K. Wenning, and P. A. Low, Second consensus statement on the diagnosis of multiple system atrophy, Neurology, vol.71, pp.670-676, 2008.

A. J. Hughes, C. Colosimo, and B. Kleedorfer, The dopaminergic response in multiple system atrophy, J Neurol Neurosurg Psychiatry, vol.55, pp.1009-1013, 1992.

M. Magalhães, G. K. Wenning, S. E. Daniel, and N. P. Quinn, Autonomic dysfunction in pathologically confirmed multiple system atrophy and idiopathic Parkinson's disease-a retrospective comparison, Acta Neurol Scand, vol.91, pp.98-102, 1995.

J. M. Senard, S. Raï, and M. Lapeyre-mestre, Prevalence of orthostatic hypotension in Parkinson's disease, J Neurol Neurosurg Psychiatry, vol.63, pp.584-589, 1997.

D. Berg, A. E. Lang, and R. B. Postuma, Changing the research criteria for the diagnosis of Parkinson's disease: obstacles and opportunities, Lancet Neurol, vol.12, pp.514-524, 2013.

M. J. Forjaz, A. Ayala, and C. M. Testa, Proposing a Parkinson's disease-specific tremor scale from the MDS-UPDRS: MDSUpdrs tremor scale, Mov Disord, vol.30, pp.1139-1143, 2015.

J. R. Kimber, L. Watson, and C. J. Mathias, Distinction of idiopathic Parkinson's disease from multiple-system atrophy by stimulation of growth-hormone release with clonidine, Lancet Lond Engl, vol.349, pp.1877-1881, 1997.

M. Yoshita, Differentiation of idiopathic Parkinson's disease from striatonigral degeneration and progressive supranuclear palsy using iodine-123 meta-iodobenzylguanidine myocardial scintigraphy, J Neurol Sci, vol.155, pp.60-67, 1998.

S. Braune, M. Reinhardt, and R. Schnitzer, Cardiac uptake of [123I]MIBG separates Parkinson's disease from multiple system atrophy, Neurology, vol.53, pp.1020-1025, 1999.

A. Druschky, M. J. Hilz, and G. Platsch, Differentiation of Parkinson's disease and multiple system atrophy in early disease stages by means of I-123-MIBG-SPECT, J Neurol Sci, vol.175, pp.3-12, 2000.

D. M. Raffel, R. A. Koeppe, and R. Little, PET measurement of cardiac and nigrostriatal denervation in Parkinsonian syndromes, J Nucl Med Off Publ Soc Nucl Med, vol.47, pp.1769-1777, 2006.

E. J. Chung, W. Y. Lee, and W. T. Yoon, MIBG scintigraphy for differentiating Parkinson's disease with autonomic dysfunction from Parkinsonism-predominant multiple system atrophy, Mov Disord Off J Mov Disord Soc, vol.24, pp.1650-1655, 2009.

K. Kimpinski, V. Iodice, and D. D. Burton, The role of autonomic testing in the differentiation of Parkinson's disease from multiple system atrophy, J Neurol Sci, vol.317, pp.92-96, 2012.

M. Köllensperger, K. Seppi, and C. Liener, Diffusion weighted imaging best discriminates PD from MSA-P-a comparison with tilt table testing and heart MIBG scintigraphy, Mov Disord Off J Mov Disord Soc, vol.22, pp.1771-1776, 2007.

H. Nagayama, M. Ueda, and M. Yamazaki, Abnormal cardiac [(123)I]-meta-iodobenzylguanidine uptake in multiple system atrophy, Mov Disord Off J Mov Disord Soc, vol.25, pp.1744-1747, 2010.

S. Gilman, P. A. Low, and N. Quinn, Consensus statement on the diagnosis of multiple system atrophy, J Neurol Sci, vol.163, pp.94-98, 1999.

K. Zhang, Y. Zeng, and C. Song, The comparison of clonidine, arginine and both combined: a growth hormone stimulation test to differentiate multiple system atrophy from idiopathic Parkinson's disease, J Neurol, vol.257, pp.1486-1491, 2010.

M. T. Pellecchia, R. Pivonello, A. Colao, and P. Barone, Growth hormone stimulation tests in the differential diagnosis of Parkinson's disease, Clin Med Res, vol.4, pp.322-325, 2006.

S. Orimo, M. Suzuki, A. Inaba, and H. Mizusawa, 123I-MIBG myocardial scintigraphy for differentiating Parkinson's disease from other neurodegenerative parkinsonism: a systematic review and meta-analysis, Parkinsonism Relat Disord, vol.18, pp.494-500, 2012.

G. Treglia and E. Cason, Meta-analysis on MIBG scintigraphy in differential diagnosis between Parkinson's disease and neurodegenerative parkinsonism, Parkinsonism Relat Disord, vol.18, p.806, 2012.

T. N. Thomaides, K. R. Chaudhuri, and S. Maule, Growth hormone response to clonidine in central and peripheral primary autonomic failure, Lancet Lond Engl, vol.340, pp.263-266, 1992.

C. Tranchant, C. Guiraud-chaumeil, A. Echaniz-laguna, and J. M. Warter, Is clonidine growth hormone stimulation a good test to differentiate multiple system atrophy from idiopathic Parkinson's disease?, J Neurol, vol.247, pp.853-856, 2000.

C. E. Clarke, P. S. Ray, and J. M. Speller, Failure of the clonidine growth hormone stimulation test to differentiate multiple system atrophy from early or advanced idiopathic Parkinson's disease, Lancet Lond Engl, vol.353, pp.1329-1330, 1999.

C. Colosimo, A. Albanese, and A. J. Hughes, Some specific clinical features differentiate multiple system atrophy (striatonigral variety) from Parkinson's disease, Arch Neurol, vol.52, pp.294-298, 1995.

R. R. Walsh, F. Krismer, and W. R. Galpern, Recommendations of the global multiple system atrophy research roadmap meeting, vol.90, pp.74-82, 2018.

A. H. Rajput, B. Rozdilsky, and A. Rajput, Accuracy of clinical diagnosis in parkinsonism-a prospective study, Can J Neurol Sci J Can Sci Neurol, vol.18, pp.275-278, 1991.

G. K. Wenning, Y. Ben-shlomo, and M. Magalhães, Clinicopathological study of 35 cases of multiple system atrophy, J Neurol Neurosurg Psychiatry, vol.58, pp.160-166, 1995.