AGREE-S: AGREE II extension for surgical interventions: appraisal instrument by Antoniou, SA, Florez, ID, Markar, S, Logullo, P, López-Cano, M, Silecchia, G, Antoniou, GA, Tsokani, S, Mavridis, D, Brouwers, M, Dayem, YSA, Bertolaccini, L, Alonso-Coello, P, Akl, E, Chand, M, Como, JJ, de Borst, GJ, Di Saverio, S, Emile, S, Eom, BW, Gorter, R, Hanna, G, Immonen, K, Lai, Q, Lumen, N, Mathew, JL, Montendori, A, Moya, M, Pellino, G, Sanabria, A, Saratzis, A, Smart, N, Stefanidis, D, Zaninotto, G