The issue focused on the study of secret research being carried out in medical facilities. The researchers said that most cases of cancer are found in patients who have had little or no contact with scientists, such as doctors and dentists, so it is very important to follow up on these studies.

A total of 19 European countries were involved in the study, which was led by German researchers. It also included 23 US states, 20 UK states, three French states, two Canadian provinces, one Australian state, and New