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We calculated the duration of smoking cessation from the onset of quitting to the relapse of smoking, occurrence of study outcomes, or the end of follow-up (Table S1 in the Supplementary Appendix)

Along the way, the side-effects went from temporary to permanent: at first, he only felt a little restless and had trouble sleeping

Q: If radon is radioactive, then are the devices used to test it also radioactive

Oxidative stress is a complex phenomenon involved in the physiology and pathophysiology of many lung diseases, and a number of studies have shown that the interaction between ROS and autophagy is closely associated with the development of many lung diseases, including COPD