[1] Univ Greenwich, Sch Hlth Sci Hlth & Human Sci, Fac Educ, Avery Hill Campus,Avery Hill Rd, London SE9 2UG, England
[2] South London & Maudsley NHS Fdn Trust, Univ Hosp, Smoking Cessat Dept, Lewisham High St, London SE13 6LH, England
[3] Soochow Univ, Sch Nursing, Suzhou 215006, Peoples R China
[4] Univ Greenwich, Sch Sci, Medway Campus,Cent Ave, Chatham ME4 4TB, Kent, England
[5] Birmingham City Univ, Fac Hlth Educ & Life Sci, Ravensbury House,City South Campus, Birmingham B15 3TN, W Midlands, England
[6] Coventry Univ, Sch Nursing Midwifery & Hlth, Fac Hlth & Life Sci, Ctr Healthcare Res, Priory St, Coventry CV1 5FB, W Midlands, England