有点问题

We are unable to find the verified email address for the author XXX. Please provide the verified email address for the below mentioned points.

A different email address (institutional).

Link to an institutional website that shows their email address.

A previous publication that shows their email address.

Letter from institution (e.g. Head of Dept) confirming position at institution. This must come directly from the HoD, not via a co-author.

最后一个怎么提供啊？