In case you were wondering:
“The Left Hand Second to Fourth Digit Ratio (2D:4D) Does Not Discriminate World-Class Female Gymnasts from Age Matched Sedentary Girls,” Maarten W. Peeters, Albrecht L. Claessens [pictured here], PLoS ONE 7(6): e40270. doi:10.1371/journal.pone.0040270. The authors are at KU Leuven, Leuven, Belgium.