aDivision of Allergy, Rheumatology, and Immunology, University of Cincinnati College of Medicine, Cincinnati

bBernstein Clinical Research Center, Kenwood, Ohio, USA

Correspondence to David I. Bernstein, MD, Professor Emeritus of Medicine, Division of Immunology, Rheumatology and Allergy, University of Cincinnati College of Medicine, 231 Albert Sabin Way Room 7507, Cincinnati, OH 45267-0563, USA. E-mail: [email protected]