covid-19 regulations: to enter the clinic visitor must hold a valid pcr / rapid or vaccine    covid-19 regulations: to enter the clinic visitor must hold a valid pcr / rapid or vaccine    covid-19 regulations: to enter the clinic visitor must hold a valid pcr / rapid or vaccine    covid-19 regulations: to enter the clinic visitor must hold a valid pcr / rapid or vaccine    covid-19 regulations: to enter the clinic visitor must hold a valid pcr / rapid or vaccine