Olfactory detection of human bladder cancer by dogs: Authors' reply

EDITOR—We were well aware of the need to consider lifestyle and environmental factors associated with bladder cancer. As stated in our methods section, we collected comprehensive data on each participant, including occupation, dietary intake, hobbies, drug treatment, and, most importantly, smoking habits. We specifically designed the training regimen to take into account the association between smoking, bladder cancer, and the possible presence of tobacco related odours in …