Central defects of autonomic function in secondary progressive multiple sclerosis: observations based on cardiovascular and growth hormone responses to clonidine. Thomaides TN, Zoukos Y, Chaudhuri KR, Watson L, Mathias CJ Eur J Neurol. 1995 Jul; 2(3):163-9. PMID: 24283632. Abstract CommentRecommendBookmarkWatch