El Shabrawy, S.
Miglierini, M.
Schaaf, P.
Tzankov, D.
Georgieva, M.
Harizanova, R.
Rüssel, C.
Funding for this research was provided by:
Deutscher Akademischer Austausch Dienst Kairo (A1392921)
Bundesministerium für Bildung und Forschung (05K16Sl1)
Article History
Received: 4 August 2017
Accepted: 28 February 2018
First Online: 19 March 2018
Compliance with ethical standards
: We declare that we agree with the ethical standards of the journal.
: Part of this study was funded by the German Academic Exchange Service (DAAD) and Bundesministerium für Forschung und Technologie via DESY PT under grant 05K16Sl1.
: The authors declare that they have no conflict of interest.