Particularly, eight studies examined populations with heterogeneous musculoskeletal pain (neck, head, limbs, shoulder and lumbar areas) [29,30,31,32,33,34,37,38]; one was focused on general chronic pain [36], one on Neurofibromatosis type 1 (NF1), and on Neurofibromatosis type 2 (NF2) or Schwannomatosis [35]. Here, NF2 is linked to schwannomatosis.