1. Atacora Departmental Hospital Center, Atacora, Benin
2. General Surgery Department, Centre Hospitalier Départemental Universitaire de Parakou, Parakou, Benin
3. Centre de Santé Communal de Natitingou, Zone Office Natitingou, Boukoumbé Toucountouna, Natitingou, Benin
4. Department of Surgical Sciences, Sapienza University of Rome, Rome, Italy