B5E70FF5-E3EB-49A0-9166-3C91FB786E5FChildren Learning About Second-hand Smoke (CLASS II): A pilot cluster randomised controlled trialResearch GrantMR/M020533/1C008C651-F5B0-4859-A334-5F574AB6B57CMRCINCOME_ACTUAL14964913CA00EE-76CC-4D6B-8090-A0961EE6CBA1Children Learning About Secondhand Smoke (CLASS II): protocol of a pilot cluster randomised controlled trial.BMJ open25223c5940773263b10713f2affbe3b1Siddiqi K2015-01-01http://dx.doi.org/10.1136/bmjopen-2015-00874926307620http://ukpmc.ac.uk/abstract/MED/263076202044-6055http://europepmc.org/abstract/MED/2630762058Journal Article/Review5675eaba085a3