Acknowledgment
We are grateful to all participants for their bravery in giving blood and their parents for their great support, the Bavarian red cross for support in Tirschenreuth and especially Mr. Schedel; the students who helped organizing the study, packing study sets, transporting sets and samples across the study areas; the assistants and helpers in all pediatric outpatient clinics who did a tremendous job on top of their routine work; all lab personal in the involved laboratories for extra and weekend hours; and Birgit Kulawik for providing graphic design. We thank the WECARE research and development campus at the KUNO hospital St. Hedwig in Regensburg for the generous logistical support.