Psychosocial factors in children and adolescents with migraine and tension-type headache: a controlled study and review of the literature. - Karwautz,A.; Wober,C.; Lang,T.; Bock,A.; Wagner-Ennsgraber,C.; Vesely,C.; Kienbacher,C.; Wober-Bingol,C. (Cephalagia, 1999)