Thanks for cicular II, safely received. Our abstracts will follow. Best wishes Britta and Birgitta BSc Britta Stenberg Tyrefors Alvägen 6 19447 Upplands Väsby, Sweden Phone+fax +468 59031285 MSc Birgitta M. Johansson Hornsgatan 170 11728 Stockholm, Sweden Phone+fax +4686684736