“…Classification containing 16 studies 34,48,49,58,60,79,80,100,112,116-118, 128,129,135,139 . Named Entity Recognition has been widely used in different clinical applications: 10 studies of Disease information & Classification 39,56,65,66,68,76,103,115,122,124 , 9 studies of Language discovery & knowledge 50,52,55,74,81,85,104,107,131 and 8 of Diagnostic surveillance 82,84,[87][88][89][90]92,133 . In particular, there were some areas (represented by small circles in the figure) that were clearly understudied, for example, Text Classification for Diagnostic surveillance 91,99 , Entity Normalisation for Diagnostic surveillance 126 and Natural Language Generation in any application domains 63 .…”