1 Department of Dermatology, University of Pittsburgh School of Medicine, Pennsylvania. Electronic address: govas@doctors.org.uk.
2 Department of Dermatology, University Hospitals of Cleveland, Ohio.
3 Health Sciences Library System, University of Pittsburgh, Pennsylvania.
4 Department of Dermatology, University Hospitals of Cleveland, Ohio; Department of Dermatology, Case Western Reserve University, Cleveland, Ohio; Department of Pharmacology, University of Pittsburgh School of Medicine, Pennsylvania.