Franz H. Müller in 1939 and E. Schairer in 1943 first used case-control epidemiological methods to study lung cancer among smokers. In 1939, Müller published a study report in a reputed cancer journal in Germany claiming that prevalence of lung cancer was higher among smokers. Müller, described as the "forgotten father of experimental epidemiology", was a member of the National Socialist Motor Corps (NSKK) and the National Socialist German Workers’ Party (NSDAP). Müller's 1939 medical dissertation was the world's first controlled epidemiological study of the relationship between tobacco and lung cancer. Apart from mentioning the increasing incidents of lung cancer and many of the causes behind it such as dust, exhaust gas from cars, tuberculosis, X-ray and pollutants emitted from factories, Müller's paper pointed out that "the significance of tobacco smoke has been pushed more and more into the foreground".