Parental catastrophizing about their child's chronic pain: are mothers and fathers different? - Hechler, T; Vervoort, T; Hamann, M; Tietze, A L; Vocks, S; Goubert, L; Hermann, C; Wager, J; Blankenburg, M; Schroeder, S; Zernikow, B (Eur J Pain, 2011)