<qa>  What is the intent of the test?The intent is to test precision pinch grip testing with a custom built device being developed by the University of Birmingham. This device is based on those already used by Zhang and Hsu et al, and is not anticipated to pose any risk of harm to the patient. The investigators do not know of any side effects that there may be from the grip test. Patients may find their hand to be a little tired after the test; however this should not last long and should not be severe. The investigators think the risk of injury posed to patients by the grip device is very small. The investigating team will have trialed the device on healthy volunteering members of the research team prior to use in the study. 