Competing interests
Christian Apfelbacher has received institutional funding from Dr. August Wolff GmbH & Co. KG Arzneimittel, and consultancy fees from Dr. August Wolff GmbH & Co. KG Arzneimittel, LEO Pharma, RHEACELL and Sanofi Genzyme. Clarissa Masur is and Christoph Abels was an employee of Dr. August Wolff GmbH & Co. KG Arzneimittel. Paul Kamudoni is a developer of the HidroQoL and is an employee of Merck Healthcare KgaA. Sam Salek is a joint developer of the HidroQoL, has received unrestricted educational grants from GlaxoSmithKline, European Hematology Association, Novartis, Bristol Meyer Squib, Sanofi, Celgene and consultancy fees from Pfizer and Agios.