Convergence or divergence in OECD health care systems? Paper prepared for the 11th International Research Seminar on „Issues in Social Security”, organised by the Foundation of International Studies of Social Security (FISS) and the Swedish Federation of Social Insurance Offices (FKF), Sigtuna, Sweden, 19th - 21st June 2004 - Wendt,C.; Grimmeisen,S.; Rothgang,H.