[1] Univ Limerick, Sch Med, Castletroy, Limerick, Ireland
[2] Univ Hosp Limerick, Dept Surg, Dooradoyle, Limerick, Ireland
[3] Univ Hosp Limerick, Dept Anaesthesia & Intens Care, Dooradoyle, Limerick, Ireland
[4] Univ Hosp Limerick, Dept Microbiol, Dooradoyle, Limerick, Ireland
[5] Univ Hosp Limerick, Dept Histopathol, Dooradoyle, Limerick, Ireland