adolescent adolescentpsychotherapy biologicalpsychiatry centralnervoussystem child counselingof development etc griefinadolescence grieftherapy growth handbooks loss(psychology)inadolescence manuals methods neurobiology post-traumatic post-traumaticstressdisorderinadolescence post-traumaticstressdisorderinchildren psychictraumainchildren psychotherapy stressdisorders teenagers therapy traumatic treatment