If I still lived in Philly, I'd go here:
Drexel University of Medicine,
Hahnemann University Hospital -
Philadelphia PA
ADULT PROGRAM
William Sexauer, M.D. (215) 762-7581
Since you live near Allentown, there appears to be one in Bethlahem.
Saint Luke's Hospital - Outreach Clinic
Bethlehem PA
Laurie Varlotta, M.D. (610) 954-4975