An application to receive contributions of leave from a leave bank, whether submitted by or on behalf of an employee
(2) shall include
(A) the name, position title, and grade or pay level of the proposed leave recipient;
(B) the reasons why leave is needed, including a brief description of the nature, severity, anticipated duration, and, if it is a recurring one, the approximate frequency of the medical emergency involved;
(C) if such Board so requires, certification from 1 or more physicians, or other appropriate experts, with respect to any matter under subparagraph (B); and
(D) any other information which such Board may reasonably require. If a Board requires that an employee obtain certification under paragraph (2)(C) from 2 or more sources, the agency shall ensure, either by direct payment to the expert involved or by reimbursement, that the employee is not required to pay for the expenses associated with obtaining certification from more than 1 of such sources.