Cai, Aijia http://orcid.org/0000-0001-8738-9298
Maringa, Linda
Hauck, Theresa
Boos, Anja M.
Schmitz, Marweh
Arkudas, Andreas
Horch, Raymund E.
Ludolph, Ingo
Article History
First Online: 23 August 2019
Compliance with Ethical Standards
: This retrospective study was approved by the institutional ethics committee (approval number 3_17 B) and was in accordance with the 1964 Helsinki declaration and its later amendments. All subjects gave informed consent prior to their enrollment.
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.