The effect of hospital-type and operating volume on the survival of hip replacements. A review of 39505 primary total hip replacements reported to the Norwegian Athroplasty Register, 1988 - 1996. - Espehaug,B.; Havelin,L.I.; Engesaeter,L.B.; Vollset,S.E. (Acta Orthop Scand, 1999)