This paper partly describes work undertaken in the context of the
EC IST project Integrated Microsystem for the Magnetic Isolation
and Analysis of Single Circulating Tumor Cells for Oncology Diagnostics and Therapy Follow-up (MASCOT) FP6-2005-IST-027652.
The IST program is partially funded by the European Commission.
Financial support by the SAFE Network of Excellence (LSHB-CT-
2004-503243) is also acknowledged.
