Funding for this research was provided by:
Financial support was obtained through the ECPGR Activity Grant Scheme (Phase IX) First Call (PRUNDOC Project) and Fifth Call (Prunus Alignment Project).
Received: 16 July 2019
Accepted: 6 February 2020
First Online: 13 February 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.