The authors regret that a typographical error was introduced in the methods section on page 9, where the concentration of a reagent was mistyped. The concentration of Tris HCL in the lysis buffer should be 38 mM rather than 100 mM. The following sentence: “180 µl of lysis buffer (100 mM Tris HCL pH 8.5, 0.5 % Tween 20, and 200 µg/ml proteinase K)” should read: “180 µl of lysis buffer (38 mM Tris HCL pH 8.5, 0.5 % Tween 20, and 200 µg/ml proteinase K)”. The authors would like to apologize for any inconvenience caused.