Validation Of Operation Theatres As Per Nabh Standards And Calibration Of Medical Freezers Through Nabl Authorised Firms At Homi Bhabha Cancer Hospital Research Center Visakhapatnam, Andhra Pradesh, 530053. Validation Of Operation Theatres As Per Nabh Standards And Calibration Of Medical Freezers Through Nabl Authorised Firmsat Homi Bhabha Cancer Hospital Research Center Visakhapatnam, Andhra Pradesh, 530053.