Postage stamps and postal history of Nigeria the British Commonwealth and a new definitive set was issued on 1 November 1965. Between 1960 and 1961 Nigerian definitives of 1953-57 were overprinted "CAMEROONS/U.K.T.T." for use in Southern Cameroons of the British Mandate territory of British Cameroons. This issue was also valid for use in Northern Cameroons until it joined Nigeria. In 1961, Southern Cameroons became part of Cameroon. Between 30 May 1967 and 15 January 1970, the region of Biafra attempted to secede from Nigeria and issued their own postage stamps. Eventually, after a bloody civil war they rejoined Nigeria. Postage stamps and postal history of Nigeria This
Hoehn and Yahr scale Hoehn and Yahr scale The Hoehn and Yahr scale is a commonly used system for describing how the symptoms of Parkinson's disease progress. It was originally published in 1967 in the journal "Neurology" by Melvin Yahr and Margaret Hoehn and included stages 1 through 5. Since then, a modified Hoehn and Yahr scale was proposed with the addition of stages 1.5 and 2.5 to help describe the intermediate course of the disease. This rating system has been largely supplanted by the Unified Parkinson's Disease Rating Scale, which assesses limitation of daily activities and non-motor symptoms in more detail. A 2010