National Medical Journal of China, Volume 79, Issue 10,1999, Pages 797-798,
National Medical Journal of China, Volume 79, Issue 10,1999, Pages 742-744,
National Medical Journal of China, Volume 79, Issue 10,1999, Pages 780-783,
National Medical Journal of China, Volume 79, Issue 10,1999, Pages 796,
National Medical Journal of China, Volume 79, Issue 10,1999, Pages 777-779,