Doctor "The healing of major wounds and crippled limbs. Without this skill, it will take a much longer period of time to restore crippled limbs to use." The higher your skill is, the higher the chance that you will be able to heal a wound (or even multiple wounds). Besides you will use it much faster, because of lower cooldown. While perk Reanimator will also grant you a chance to ressurect other players. For each healed organ you will receive 200xp. Max. chance to heal a crippled limb is 95%
You can use Doctor again, when your time-out will reach 9 minutes.
5%+(PE+IN) is a % with which your character will start.