[1] Univ Coll Cork, Sch Publ Hlth, Western Gateway Bldg, Western Rd, Cork T12XF62, Ireland
[2] Bon Secours Hosp, Pharm Dept, Cork, Ireland
[3] Univ Limerick, Dept Nursing & Midwifery, Limerick, Ireland
[4] Hlth Protect Surveillance Ctr, Off Natl Director Hlth Protect, HSE, Dublin, Ireland
[5] Fac Nursing & Midwifery, RCSI, Dublin, Ireland
[6] Solent Univ, Dept Social Sci & Nursing, Southampton, England
[7] Kings Coll Hosp Fdn NHS Trust, Infect Prevent & Control Dept, London, England