<unk>  (also known as<unk>  trials, medical<unk> ,<unk>  studies, or<unk>  studies) is any study intended to help answer questions about etiology, diagnostic approaches or new treatments by studying their effects on human subjects.<unk>  trials are designed and conducted by scientists and medical experts, who invite participants to undergo testing new vaccines, therapies, or treatments. Only a small fraction of patients with<unk> 's<unk>  (PD) participate in<unk><unk>  and specially in<unk>  trials. When<unk>  trials lack participation, it causes a significant delay in the development of new drugs and treatments.
Parkinson's disease clinical research
Spinal cord injury research
Multiple sclerosis research
Research into centenarians
Personal health application
HIV/AIDS research
Multiple sclerosis drug pipeline
Cancer research