1 Department of Radiology (F.K.), Aga Khan University Hospital, Karachi, Sindh ,Pakistan; Department of Medicine (S.F.S.), Jinnah Postgraduate Medical Center, Karachi, Sindh, Pakistan; Department of Medicine (F.A., N.H., E.W.), Mayo Hospital, Lahore, Pakistan; Department of Medicine (U.K.), Dow University of Health Sciences, Karachi, Sindh, Pakistan; Department of Medical Oncology (A.A.J.), Aga Khan University Hospital, Karachi, Sindh, Pakistan.
2 Department of Radiology (F.K.), Aga Khan University Hospital, Karachi, Sindh ,Pakistan; Department of Medicine (S.F.S.), Jinnah Postgraduate Medical Center, Karachi, Sindh, Pakistan; Department of Medicine (F.A., N.H., E.W.), Mayo Hospital, Lahore, Pakistan; Department of Medicine (U.K.), Dow University of Health Sciences, Karachi, Sindh, Pakistan; Department of Medical Oncology (A.A.J.), Aga Khan University Hospital, Karachi, Sindh, Pakistan. Electronic address: ughansham@yahoo.com.