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Cullati, Stéphane, Delphine S. Courvoisier, Angèle Gayet-Ageron, Guy Haller, Olivier Irion, Thomas Agoritsas, Sandrine Rudaz, and Thomas V. Perneger. "Patient Enrollment and Logistical Problems Top the List of Difficulties in Clinical Research: A Cross-sectional Survey." BMC Med Res Methodol 2016.

Cullati, Stéphane, et al. "Patient Enrollment and Logistical Problems Top the List of Difficulties in Clinical Research: A Cross-sectional Survey." BMC Med Res Methodol 2016.