(a) The board of trustees may establish advisory committees as it considers necessary to assist it in performing its duties. Members of advisory committees established under this section serve at the pleasure of the board.
(b) Notwithstanding any other law to the contrary, the board of trustees by rule shall determine the amount and manner of any compensation or expense reimbursement to be paid members of an advisory committee performing service for the retirement system for performing the work of the advisory committee. All compensation and expense reimbursements for an advisory committee established under this section are payable from the expense account.