1. Early rising and ambulatory activity after operation;Leithauser;Arch. Surg.,1941
2. Confinement to bed for only twenty-four hours after operation;Leithauser;Arch. Surg.,1943
3. Early post-operative walking;Newburger;Surgery,1943
4. Immediate ambulation after operation;Mermingas;Zentralbl. f. Chir.,1933