Invoices with an approval status of HOLD should only be UNHELD by the user who placed the hold

As an approver, sometimes I want to research an item that is pending my approval. There are usually multiple optional approvers, so I like to place a HOLD on a item while I research it. While it's on hold, nobody should be able to remove the hold except for me. While it has a hold status, it shouldn't be payable until I remove the hold.