Hak Jong Lee Sun Hee Lee Kyoo Seob Ha Hak Chul Jang Woo-Young Chung Ju Young Kim Yoon-Seok Chang Dong Hyun Yoo Ubiquitous healthcare service using Zigbee and mobile phone for elderly patients. 193-198 2009 78 I. J. Medical Informatics 3 http://dx.doi.org/10.1016/j.ijmedinf.2008.07.005 db/journals/ijmi/ijmi78.html#LeeLHJCKCY09