Classifying the diagnosis of study participants in clinical trials: a structured and efficient approach oleh Tjitske S. R. van Engelen, Maadrika M. N. P. Kanglie, Inge A. H. van den Berk, Merel L. J. Bouwman, Hind J. M. Suhooli, Sascha L. Heckert, Jaap Stoker, Patrick M. M. Bossuyt, Jan M. Prins, For the OPTIMACT Study Group