1. Harvard Medical School, Department of Genetics, Boston, Massachusetts 02115, United States
2. Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts 02115, United States
3. Roche Sequencing Solutions, Santa Clara, California 95050, United States
4. Columbia University, Center for Genome Technology and Biomolecular Engineering, Department of Chemical Engineering, New York, New York 10027, United States