A surprisingly poor correlation between in vitro and in vivo testing of biomaterials for bone regeneration: results of a multicentre analysis oleh G Hulsart-Billström, JI Dawson, S Hofmann, R Müller, MJ Stoddart, M Alini, H Redl, A El Haj, R Brown, V Salih, J Hilborn, S Larsson, ROC Oreffo