Assertion: concussion's symptom | /r/HasProperty | difficult to spot
Facets:
value: often
type: TEMPORAL
Source sentences:
text: These athletic trainers assist medical personnel located on the sidelines in identifying potential concussions because the symptoms are often difficult to spot and assess from the field level.
text: The symptoms above are still important in children but may be difficult to spot due to the child's age, so additional red flags in infants and children are that they: