[Practicability and Efficiency of E-health Applications in Patient-Reported Outcomes: State of and Need for Research].

Aims: E-health-based technologies also play an increasing role in the collection of patient- reported outcomes (ePRO). However, it remains unclear how feasible and powerful e-health applications are in the collection of PRO. Therefore, it should be examined to what extent the requirements for the use of technology-based PRO instruments has already been explored in order to allow its broad use in the "e-health world".