Affiliation: | (1) Department of Mathematics and Statistics, University of Vermont, 16 Colchester Avenue, Burlington, VT, 05401-1455, USA. e-mail: wlakin@together.net, US;(2) School of Science, Penn State Erie, The Behrend College, Erie, PA, 16563 USA. e-mail: sas56@psu.edu, US;(3) Division of Neurosurgery, University of Vermont, Burlington, VT, 05405, USA. e-mail: btranmer@zoo.uvm.edu; Paul.Penar@vtmednet.org, US |