 Complete the following phrase:  In a 1987 study by the International Conference of Symphony and Opera Musicians, it was shown that 27 of interviewed members admitted to using beta blockers such as propranolol for musical performances. For about 1016 of performers, their degree of stage fright is considered pathological. Propranolol is used by musicians, actors, and public speakers for its ability to treat anxiety symptoms activated by the sympathetic nervous system. It has also been used as a performance-enhancing drug in sports where high accuracy is required, including archery, shooting, golf, and snooker. In the 2008 Summer Olympics, 50-metre pistol silver medalist and 