[1] Columbia Univ, Sch Nursing, 560 168th St, New York, NY 10032 USA
[2] St Camillus Int Univ Hlth Sci, Via St Alessandro 8, I-00131 Rome, Italy
[3] Finnish Inst Hlth & Welf, POB 30, Helsinki 00271, Finland
[4] UMIT Tirol Private Univ Hlth Sci & Hlth Technol, Eduard Wallnofer Zent 1, A-6060 Tyrol, Hall, Austria
[5] Nord Univ, POB 1490, N-8049 Bodo, Norway
[6] Norwegian Nurses Org, POB 456, N-0104 Oslo, Norway
[7] Pflege PBS projects Res consulting, Obere Hofbergstr 10, CH-9500 Wil, Switzerland
[8] Netherlands Inst Hlth Serv Res Nivel, POB 1568, NL-3500 BN Utrecht, Netherlands