[1] Univ Athens, ATTIKON Univ Hosp, Dept Psychiat 2, Rimini 1, Athens 12462, Greece
[2] Kings Coll London, Inst Psychiat Psychol & Neurosci, London SE5 8AF, England
[3] Natl & Kapodistrian Univ Athens, Dept Therapeut, Alexandra Hosp, Athens 11528, Greece
[4] Natl & Kapodistrian Univ Athens, Laikon Gen Hosp, Dept Surg 1, Athens 11527, Greece
[5] Lausanne Univ Hosp, Dept Oncol, Ctr Hosp Univ Vaudois, CH-1011 Lausanne, Switzerland
[6] Karolinska Univ Hosp, Paediat Infect Dis Dept, S-17177 Stockholm, Sweden
[7] South Tyneside & Sunderland NHS Fdn Trust, Dept Neurophysiol, Sunderland SR47TP, Tyne & Wear, England
[8] MITERA Hosp, Dept Gynaecol Oncol, Athens 15123, Greece
[9] Natl & Kapodistrian Univ Athens, Dept Propaedeut Surg 2, Sch Med, Athens 11527, Greece
[10] Hygeia Hosp, Dept Gastroenterol, Athens 15123, Greece
[11] Bedfordshire Hosp NHS Fdn Trust, Luton & Dunstable Univ Hosp, Dept Dermatol, Luton LU4 0DZ, Beds, England
[12] Metaxa Canc Hosp, Dept Med Oncol, Athens 18537, Greece
[13] South London & Maudsley NHS Fdn, London SE5 8AZ, England
[14] Elysium Healthcare, Thornford Pk, Thatcham RG19 8ET, Berks, England
[15] Aristotle Univ Thessaloniki, Ahepa Univ Hosp, Sch Med, Dept Surg 3, Thessaloniki 54621, Greece
[16] Univ Crete, Sch Med, Lab Clin Virol, Iraklion 71003, Greece
[17] Natl & Kapodistrian Univ Athens, Sch Med, Dept Clin Therapeut, Hematol & Med Oncol, Athens 11527, Greece
[18] Univ Athens, EGINIT Hosp, Dept Psychiat 1, Athens 11528, Greece