A comparative study of mobile electronic data entry systems for clinical trials data collection. - Elodia B. Cole; Etta D. Pisano; Gregory J. Clary; Donglin Zeng; Marcia Koomen; Cherie M. Kuzmiak; Bo Kyoung Seo; Yeonhee Lee; Dag Pavic (Int. J. Medical Informatics, 2006)