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The same with Club

Randomisation procedure Randomisation sequences were prepared by Cromsource Srl (Verona, Italy) with SAS statistical software version 9.3 (SAS Institute Inc., Cary, NC) and using a Williams latin square design composed of 8 blocks of 4 subjects

"It is important to measure trace metals from secondhand smoke because some metals are also present in indoor and outdoor sources of pollution," said Hugo Destaillats, the study's lead researcher and senior scientist at Indoor Environment Group-Berkeley Lab

Toxic metals, including beryllium, cadmium, lead, and polonium-210, are also present in cigarette smoke in measurable quantities, 79,80 levels of which may depend in part on the region of the world where the tobacco was grown