Combat Medic
You know the urgency of treating wounds in the heat of battle, applying first aid to your allies with such speed that you assure no one gets left behind.
Prerequisite: Heal 5 ranks.
Benefit: Whenever you use Heal to provide first aid, treat caltrop wounds, or treat poison on an ally who also has this feat, you provoke no attacks of opportunity, and can take 10 on the check.
Source: Ultimate Combat, p. 92