Ramalho, A.C., Lazaretti-Castro, M., Hauache, O., Vieira, J.G., Takata, E., Cafalli, F. e Tavares, F. 2001. Osteoporotic fractures of proximal femur: clinical and epidemiological features in a population of the city of São Paulo. São Paulo Medical Journal. 119, 2 (mar. 2001), 48–53.