@article {1020, title = {Subpopulation-based correspondence modelling for improved respiratory motion estimation in the presence of inter-fraction motion variations}, journal = {Physics in Medicine and Biology}, volume = {62}, year = {2017}, pages = {5823-5839}, issn = {1361-6560}, doi = {10.1088/1361-6560/aa70cc}, author = {Wilms, Matthias and Werner, ReneĢ and Yamamoto, Tokihiro and Heinz Handels and Jan Ehrhardt} }