作者单位:Unit of Health Sciences and Education, University of Hamburg, Hamburg, Germany, Nursing Research[1]MediStatistica, Neuenrade, Germany[2]Unit of Health Sciences and Education, University of Hamburg, Hamburg, Germany[3]School of Nursing Science, Faculty of Health, Witten/Herdecke University, Witten, Germany[4]Unit of Health Sciences and Education, University of Hamburg, Hamburg, Germany, Medical Faculty[5]