(Camouflage fatigues) may pertain-to a military-or-other-action-organization.
Causes can be constituted-of-or-filled-with (chronic fatigue).
One-half can be to two-thirds of (chronic fatigue syndrome patients).
Two-thirds can be constituted-of-or-filled-with (chronic fatigue syndrome patients).
One-half to two-thirds of (chronic fatigue syndrome patients) may have a history of depression.