Acknowledgments
The authors thank all the participants in the study. The authors also thank all research nurses and physicians at the sites, as well as Ingela Johansson, Gosia Smolinska and Claudia Matzke for skillful laboratory work. The authors are grateful to Dr. Joachim Davidsson (Department of Radiology, Linköping University Hospital, Linköping, Sweden) for skillful performance of the needle-guided lymph node injections and instructions to other centers.