Table 1 Search strategy for Embase and PubMed

#1

“microglia” or “microglial” or “microgliosis” or “Iba-1” or “Iba1” or “CD68” or “CD40” or “F4/80” or “CX3CR1” or “CD11b” or “CD45” or “TMEM119” or “TREM2”

Microglia

#2

“brain injury” or “brain injuries” or “brain damage” or “head injury” or “head injuries” or “head impact” or “head impacts”

Brain injuries

#3

“TBI” or “TBIs” or “mTBI” or “mTBIs”

Abbreviated head injuries

#4

“mild” or “concussion” or “concussions” or “concussive”

Mild qualifier

#5

“white matter” or “axon” or “axons” or “axonal” or “myelin” or “myelinating” or “myelination” or “demyelinating” or “demyelination” or “callosum” or “tract” or “fasciculus” or “fasciculi” or “cingulum” or “cingula” or “commissure” or “commissures” or “fornix” or “forceps” or “capsule” or “capsules” or “radiatum” or “radiata” or “semiovale” or “lemniscus” or “lemnisci” or “u-fiber” or “u-fibers”

White matter structures

#6

“diffusion” or “diffusivity” or “DTI” or “DWI” or “anisotropy” or “tractography” or “tractogram” or “tractograms”

Additional terms associated with white matter measurements

#7

#2 or #3

Pooled head injuries

#8

#5 or #6

Pooled white matter

#9

#1 and #4 and #7 and #8

Pooled microglia, mild qualifier, head injuries, and white matter