University of South Carolina, West Columbia, USA.
*Address for correspondence: Sunil Sharma, MD, FCCP, D'ABSM Director, Columbia Lung & Sleep Institute Adjunct Faculty, University of South Carolina 3231 Sunset Blvd, Suite F, West Columbia, SC 29169, USA. Phone: 803-719-5028, Fax: 803-454-2370, E-mail: sunyshar@gmail.com, Sunyshar@yahoo.com
