SCIENTISTS AT WORK | Read the text. Fill in the gaps with the words from the list below. Change the form of the word if necessary.

Verbs: analyse --- collaborate --- confirm --- formulate --- investigate --- publish --- reject
Nouns: evidence --- experiment --- factor --- group --- link ---records --- research

In the late 1940s, a young medical student called Ernst Wynder at Washington University became intrigued when carrying out an autopsy of a heavy smoker who had died from lung cancer. It was then that Wynder first (1) ___________ his hypothesis that smoking might be a risk (2) ___________ for cancer. He started (3) ___________ case histories of heavy smokers. His (4) ___________ brought him into contact with Dr Evarts A. Graham. Although he was skeptical about the idea at first, Graham allowed Wynder access to his (5) ___________ , and soon started (6) ___________ with the young man on the ambitious project. Together, Wynder and Graham interviewed hundreds of patients. They (7) ___________ their findings statistically and used a control (8) ___________ . They carried out (9) ___________ on mice which further (10) ___________ their hypothesis. They amassed a huge body of (11) ___________ linking smoking and cancer. In 1950 the Journal of the American Medical Association (12) ___________ their report – the first major study to demonstrate the (13) ___________ between smoking and cancer. After that, it was only tobacco companies that continued to (14) ___________ the idea that smoking and cancer are related.