Antonio G. Ruzzelli Raja Jurdak Gregory M. P. O'Hare Peter van der Stok Energy-efficient multi-hop medical sensor networking. 37-42 2007 HealthNet http://doi.acm.org/10.1145/1248054.1248064 conf/mobisys/2007h db/conf/mobisys/healthnet2007.html#RuzzelliJOS07