David W. Verner-Jeffreys, Timothy J. Welch, Tamar Schwarz, Michelle J. Pond, Martin J. Woodward, Sarah J. Haig, Georgina S. E. Rimmer, Edward Roberts, Victoria Morrison, Craig Baker-Austin
PLoS One. 2009; 4(12): e8388. Published online 2009 Dec 21. doi: 10.1371/journal.pone.0008388