Bioinformatics Laboratory, Academic Medical Center, PO Box 22700, 1100 DE Amsterdam, the Netherlands. Tel.: ++31 20 5667096, a.h.vankampen@amc.uva.nl.|Bioinformatics Laboratory, Academic Medical Center, PO Box 22700, 1100 DE Amsterdam, the Netherlands. Tel.: ++31 20 5667096, a.h.vankampen@amc.uva.nl.|Bioinformatics Laboratory, Academic Medical Center, PO Box 22700, 1100 DE Amsterdam, the Netherlands. Tel.: ++31 20 5667096, a.h.vankampen@amc.uva.nl.|Bioinformatics Laboratory, Academic Medical Center, PO Box 22700, 1100 DE Amsterdam, the Netherlands. Tel.: ++31 20 5667096, a.h.vankampen@amc.uva.nl.