Any study done on human subjects need ethical clearance before commencing the work. A medical practitioner in an institution, if he plans to start working for his/her research, gets ethical clearance or otherwise from the institution ethics committee.

What can be the ways to get one's research protocol subjected to ethical clearance for a medical practitioner who is solely doing private practice? Wherefrom he gets ethical committee clearance if he plans to do a research while solely in private practice?