gov (Clinical trial registration: NCT04059497 in Participants Eligibility was determined via a two-stage exhaled carbon monoxide (CO) validation process
Filters lasting 100+ uses often provide better long-term value despite higher initial cost
But that is not always possible
10.1038/ncomms2494 90 MukharjeeS.BankS.MaitiS
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Prior to the health examination, the participants filled in the main questionnaire which covered subjective health in general, history of diabetes, myocardial infarction, angina pectoris and stroke, tobacco smoking, leisure-time physical activity (LTPA), alcohol use, educational level, disability pension and a few other items