1. Ferring AB, POB 30561, S-200 62 Malmö, Sweden
2. Current address: Kabi Invent AB, Blickagången 6D, S-141 52 Huddinge, Sweden
3. Physical Chemistry, Umeå University, S-901 87 Umeå, Sweden
4. Drug Delivery Research, AB Hässle, S-431 83 Mölndal, Sweden
5. Food Technology, Chemical Center, POB 124, S-221 00 Lund, Sweden