Predicting the Health Condition of mHealth App Users with Large Differences in the Number of Recorded Observations - Where to Learn from? - Unnikrishnan, V.; Shah, Y.; Schleicher, M.; Strandzheva, M.; Dimitrov, P.; Velikova, D.; Pryss, R.; Schobel, J.; Schlee, Winfried; Spiliopoulou, M. (My University, 2020)