You can play in one city and three cities. There are few people playing in hospitals and few professionals. The only thing you can rest assured of is hygiene. All nurses in the hospital go to places where they have their ears pierced professionally. As long as it is disposable and disinfected, it will be fine. The more professional and influential people in Hangzhou are Master Hua and Mr. Xing. Master Hua is in the university town and Xing is in the city.