Again I ask, what is the purpose of keeping this train wreck open? The OP is not listening, will not listen, and will continue to put others at risk using any and all information he can glean here.
It's good that we have experienced, qualified, considered answers to the questions. And they are in the "record".
Your opinion is a little short on content. Medical Degrees? Overall Risk studies? You want to ban square dancing in shcools where partners swing with locked elbows? Risk to the shoulders?