3 trials - Campbell - THESEE - ACTSG (Hull) sub-group
Elective hip replacement: 1 trials - Lassen
General surgery: 2 trials - Leizorovicz - Bergqvist [42]
Orthopedic surgery: 1 trials - Lassen
Patients with immobilization of the lower extremities: 1 trials - Jorgensen
All type of patients: 3 trials - Romera - Hull - Hull et al