[1] Charite Univ Med Berlin, Dept Anaesthesiol & Intens Care Med Charite, Charite Campus Virchow Klinikum & Charite Campus, D-10117 Berlin, Germany
[2] Hosp Univ Rio Hortega, Fac Med Valladolid, Dept Anesthesiol, Valladolid, Spain
[3] Italian Natl Res Ctr Aging, IRCCS, Dept Anaesthesia Analgesia & Intens Care, Dept Geriatr Surg, Ancona, Italy
[4] Sapienza Univ Rome, Dept Anesthesiol Crit Care & Pain Med, Rome, Italy
[5] Univ Wisconsin, Dept Anaesthesiol, Madison, WI USA
[6] Merseyside Univ Liverpool, St Helens Hosp, Dept Surg, Liverpool, Merseyside, England
[7] Petrovsky Natl Res Ctr Surg, Moscow, Russia
[8] IRCCS INRCA, Geriatria Accettaz Geriatr Urgenza, Ancona, Italy
[9] Whiston Hosp, Prescot, Merseyside, England
[10] Copenhagen Univ Hosp, Sect Surg Pathophysiol, Rigshospitalet, Copenhagen, Denmark
[11] Copenhagen Univ Hosp, Lundbeck Ctr Fast track Hip & Knee Arthroplasty, Rigshospitalet, Copenhagen, Denmark
[12] Univ Edinburgh, Edinburgh Delirium Res Grp, Geriatr Med Unit, Edinburgh, Midlothian, Scotland
[13] Anaestesiologisk Afdeling, Dept Anaesthesia, Naestved, Denmark
[14] Psychiat Univ Hosp, Zurich, Switzerland
[15] Univ Med Ctr Utrecht, Dept Intens Care, Utrecht, Netherlands
[16] Univ Med Ctr Utrecht, Brain Ctr Rudolf Magnus, Utrecht, Netherlands
[17] Clin Univ St Luc, Anesthesiol Serv, Brussels, Belgium