Authors

• Michael S Kramer MD,

  1. Departments of Pediatrics and Epidemiology, McGill University, Montreal
  2. Departments of Medicine and Epidemiology of the Yale University School of Medicine, New Haven

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  • Assistant Professor of Pediatrics and Epidemiology, McGill University Faculty of Medicine, Montreal, Quebec, Canada.

• Alvan R Feinstein MD

  1. Departments of Pediatrics and Epidemiology, McGill University, Montreal
  2. Departments of Medicine and Epidemiology of the Yale University School of Medicine, New Haven

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  • Senior Biostatistician, Cooperative Studies Coordinating Center, Veterans Administration Hospital, West Haven, Conn.; Professor of Medicine and Epidemiology, Yale University School of Medicine, New Haven, Conn.