The University of Chicago recently ran a case series on family-based treatment (the Maudsley approach) for young adults. You can find information here: http://www.maudsleyparents.org/youngadults.html In all these cases there was no "substitute parent"--the actual parents helped their kids recover.
UNC-Chapel Hill is researching a couples intervention for anorexia nervosa. It's not the Maudsley approach, but it looks interesting. http://www.med.unc.edu/psych/eatingdisorders/patient-care-1/clinical-trials/ucan
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