Center of Approach and Treatment for Smokers, University Hospital, Londrina State University, University Campus, Brazil; Health Sciences Graduate Program, Health Sciences Center, State University of Londrina, Brazil. Electronic address: mporcu@uol.com.br. Health Sciences Graduate Program, Health Sciences Center, State University of Londrina, Brazil; Department of Statistics, Exact Sciences Center, State University of Londrina, Brazil. Health Sciences Graduate Program, Health Sciences Center, State University of Londrina, Brazil; Department of Pathology, Biological Sciences Center, State University of Londrina, Brazil. Center of Approach and Treatment for Smokers, University Hospital, Londrina State University, University Campus, Brazil; Department of Clinical Analysis and Toxicological, State University of Londrina, Paraná, Brazil; Health Sciences Graduate Program, Health Sciences Center, State University of Londrina, Brazil. Health Sciences Graduate Program, Health Sciences Center, State University of Londrina, Brazil. Department of Clinical Medicine, Psychiatry Unit, Health Sciences Center, Londrina State University, University Hospital, Brazil; Center of Approach and Treatment for Smokers, University Hospital, Londrina State University, University Campus, Brazil; Health Sciences Graduate Program, Health Sciences Center, State University of Londrina, Brazil. Center of Approach and Treatment for Smokers, University Hospital, Londrina State University, University Campus, Brazil; Health Sciences Graduate Program, Health Sciences Center, State University of Londrina, Brazil. Department of Statistics, Exact Sciences Center, State University of Londrina, Brazil.