@conference {, title = {Patient Activity Monitoring for Smartphones based on a PDR Algorithm}, booktitle = {: 2017 International Conference on Indoor Positioning Systems}, volume = {1}, year = {2017}, month = {09/2017}, pages = {1-10}, author = {Gualda, D and E. Diaz and J.J. Garcia and Mar{\'\i}a del Carmen P{\'e}rez and Ure{\~n}a, J.} }