Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Research Foundation, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA

Correspondence to Marie-Dominique Filippi, PhD, Division of Experimental Hematology and Cancer Biology - S7.605, Cincinnati Children's Research Foundation, 3333 Burnet Av, Cincinnati, OH 45229, USA. Tel: +513 636 0991; fax: +513 636 3768; e-mail: [email protected]