1. Stanford School of Medicine, Stanford, California, and Karolinska Institutet Stockholm Sweden
2. Karolinska Institutet Stockholm Sweden
3. Karolinska Institutet Karolinska University Hospital Stockholm Sweden
4. Karolinska Instiutet, Stockholm, and Uppsala University Uppsala Sweden
5. Harvard T. H. Chan School of Public Health Boston Massachusetts
6. Hospital for Special Surgery Weill Cornell Medical College New York New York