...骨骼部位的BMD和胫骨超声传导速度（SOS），并按BS不同分为低体表面积组（SBSG）、中等体表面积组（IBSG）和大体表面积组（LBSG）进行分析和比较。
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But, according to Andrew Young, chairman of the LBSG, many are not being properly maintained.
BBC: Letter boxes: The red heart of the British streetscape
The Letter Box Study Group (LBSG), which maps sites across the UK, is not just concerned with this postal oddity today, but with the fate of all the boxes.
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