Unni Krogstad1, Dag Hofoss, Per Hjortdahl. 1. HELTEF Foundation for Health Services Research, Central Hospital of Akershus, N-1474 Nordbyhagen, Norway. ukrogstad@heltef.no
Authors: Shuang Zhong; Michele Clark; Xiang-Yu Hou; Yuli Zang; Gerard FitzGerald Journal: Int J Environ Res Public Health Date: 2014-06-18 Impact factor: 3.390