RT Journal Article SR Electronic T1 Carbon monoxide levels in water pipe smokers in rural Laos PDR JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 517 OP 518 DO 10.1136/tobaccocontrol-2012-050431 VO 21 IS 5 A1 Lopez, Jaime Rivas A1 Somsamouth, Khamphithoune A1 Mounivong, Boualoy A1 Sinclair, Ryan A1 Singh, Pramil N YR 2012 UL http://tobaccocontrol.bmj.com/content/21/5/517.abstract AB