For the 2005 supplement, the most highly cited article was S12 (
http://www.biomedcentral.com/1471-2105/6/S2/S12) – 86 citations in total (as of 31 May 2011).

Leming Shi et al

For the 2006 supplement, the most highly cited article was S22 (
http://www.biomedcentral.com/1471-2105/7/S2/S22) – with 12 citations after two years.

Stephen Winters-Hilt et al

For the 2007 supplement, the most highly cited article was S21 (
http://www.biomedcentral.com/1471-2105/8/S7/S21) with 23 citations after two years.

Das & Dai

For the 2008 supplement, the most highly cited article was S10 (
http://www.biomedcentral.com/1471-2105/9/S9/S10) with 21 citations after two years.

Leming Shi et al

For the 2009 supplement, the most hightly cited article was S3 (http://www.biomedcentral.com/1471-2105/10/S11/S3) with 21 citations after two years.

Zhanyou Xu et al