Pitfalls of prospective non randomized studies: Why study results mislead

Affiliations

• ¹ Division of Urology, McMaster University, Hamilton, Ontario, Canada.
• ² Division of Urology, McMaster University, Hamilton, Ontario, Canada; McMaster Pediatric Surgery Research Collaborative, Department of Surgery, McMaster University, Hamilton, Ontario, Canada.
• ³ Division of Urology, McMaster University, Hamilton, Ontario, Canada; McMaster Pediatric Surgery Research Collaborative, Department of Surgery, McMaster University, Hamilton, Ontario, Canada. Electronic address: braga@mcmaster.ca.