EXHIBIT 24.4

                                 POWER OF ATTORNEY

    KNOW ALL PERSONS BY THESE PRESENTS that GOLDMAN SACHS MIDDLE MARKET LENDING
CORP. (the "Company") does hereby make, constitute and appoint each of Yvette
Kosic, Kevin P. Treanor and Laura A. Molina, (and any other employee of The
Goldman Sachs Group, Inc. or one of its affiliates designated in writing by one
of the attorneys-in-fact), acting individually, its true and lawful attorney, to
execute and deliver in its name and on its behalf whether the Company is acting
individually or as representative of others, any and all filings required to be
made by the Company under the Securities Exchange Act of 1934, (as amended, the
"Act"), with respect to securities which may be deemed to be beneficially owned
by the Company under the Act, giving and granting unto each said attorney-in-
fact power and authority to act in the premises as fully and to all intents and
purposes as the Company might or could do if personally present by one of its
authorized signatories, hereby ratifying and confirming all that said attorney-
in-fact shall lawfully do or cause to be done by virtue hereof.

    THIS POWER OF ATTORNEY shall remain in full force and effect until either
revoked in writing by the undersigned or until such time as the person or
persons to whom power of attorney has been hereby granted cease(s) to be an
employee of The Goldman Sachs Group, Inc. or one of its affiliates.

    IN WITNESS WHEREOF, the undersigned has duly subscribed these presents as of
May 14, 2018.

GOLDMAN SACHS MIDDLE MARKET LENDING CORP.


By:     /s/ Brendan McGovern
        ------------------------
Name:   Brendan McGovern
Title:  Authorized Signatory