Article History
Received: 13 November 2019
Accepted: 23 March 2020
First Online: 16 April 2020
Ethics approval and consent to participate
: Does not apply - we used only published data.
: Not applicable.
: Author HF has partially received salaries from UCB Biosciences GmbH during the time that this study was conducted. This was unrelated to this work and no influence on its content.