A person wants to study deafness and mobile phone usage. He collected data on mobile phone usage from government source and deafness from district and private clinics. This type of study is known as:

Social & Preventive Medicine

A person wants to study deafness and mobile phone usage. He collected data on mobile phone usage from government source and deafness from district and private clinics. This type of study is known as:

A study is to be conducted with regards to the fat content…

'There has been a gradual increase in number of non-communicable disease cases…

All of the following are done to remove Confounding except