“…Extrathyroidal involvement [12,14,15,20,26,27,29,30,31,32,33], multiple lateral lymph node involvement [12,14,15,27,28,29,30,34], perinodal involvement at metastatic lymph nodes [12,14,15,20,27,28,29,30,34] and distant metastatic disease [12,14,26,27,28,29,30,31,32,33] have all been cited as exclusion criteria for studies (online suppl. table 2).…”