Which of the following defines relation between quality assurance (QA), quality control (QC), internal quality assurance (lQA) & external quality assurance (EQA)

Social & Preventive Medicine

Which of the following defines relation between quality assurance (QA), quality control (QC), internal quality assurance (lQA) & external quality assurance (EQA)

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