@article { , title = {A robust and scalable microfluidic metering method that allows protein crystal growth by free interface diffusion}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {99}, year = {2002}, pages = {16531-16536}, author = {Hansen, C.L. and Skordalakes, E. and Berger, J.M. and Quake, S.R.} }