[1] Kingston Hosp Natl Hlth Serv NHS Fdn Trust, Dept Gen & Emergency Surg, Kingston Upon Thames, Surrey, England
[2] Ain Shams Univ, Med Lab Sci, Cairo, Egypt
[3] Glangwili Gen Hosp, Surg, Carmarthen, Wales
[4] Lahore Gen Hosp, Gen Surg, Lahore, Pakistan
[5] Assiut Univ, Fac Med, Gen Surg, Assiut, Egypt
[6] Kingston Hosp Natl Hlth Serv NHS Fdn Trust, Dept Gen & Emergency Surg, London, England
[7] Kings Coll Hosp Natl Hlth Serv NHS Fdn Trust, Accident & Emergency, London, England
[8] Jaber Al Ahmad Hosp, Surg, Kuwait, Kuwait
[9] Prince Philip Hosp, Internal Med, Llanelli, Wales
[10] Torbay & South Devon NHS Fdn Trust, Gen Surg, Torquay, Devon, England
[11] Kings Coll Hosp London, Radiodiag, London, England