Howell, SJ, Hoeks, SE, West, RM, Wheatcroft, SB, Hoeft, A, OBTAIN Investigators of European Society of Anaesthesiology (ESA, Leva, B, Plichon, B, Damster, S, Momeni, M, Watremez, C, Kahn, D, Dincq, A-S, Danila, A, Wittmann, M, Struck, R, Rüddel, T, Kessler, F, Rasche, S, Matsota, P, Hasani, A, Gudaityte, J, Karbonskiene, A, Ferreira, R, Carvalho, S, Tomescu, D, Martac, C, Grintescu, I, Mirea, L, Serrano, L, Sierra, P, Sabaté, S, Hernando, D, Matute, P, Trashorras, M, Suñé, M, Sarmiento, L, Hervias, A, González, O, Hermina, A, Navarro Perez, R, Orts, M, Fernandez-Garcia, R, Sanchez Pérez, D, Sepulveda Gil, I, Monedero, P, Hidalgo, F, Mbongo, C, Pont, AR, Reyes, HM, Bartolo, CG, Galera, SL, Valentijn, T, Stolker, RJ, Tugrul, M, Demirel, EE, Hough, M, Griffiths, K, Birch, S, Beardow, Z, Elliot, S, Thompson, J, Bowrey, S, Northey, M, Melson, H, Telford, R, Nadolski, M, Potter, A, Fuller, D, Rose, A, Varma, S, Simeson, K, Pettit, J, Smith, N, Martinson, V, Sleight, L, Naylor, C, Watt, P, Raymode, P, Dunk, N, Twohey, L, Hollos, L, Davies, S, Gibson, A, Coleman, Z, Tamm, T, Joscak, J, Zsisku, L, Zuleika, M, Carvalho, P, Collyer, T, Ryan, J, Colling, K, Dharmarajah, S, Krishnan, A, Paddle, J, Fouracres, A, Arnell, K, and Muhammad, K