an obese adult with premature arteriosclerosis is seen in the clinic. when her serum is tested no chylomicrons are present, ldl levels are normal, and vldl levels are increased. there is an increase in triglycerides and a slight increase in cholesterol. lipoprotein electrophoresis reveals a heavy pre-beta band. she has no skin rash and uric acid is increased. this patient most likely has what type of hyperlipoproteinemia?