Author contributions to the study and manuscript preparation include the following. Conception and design: Schievink. Acquisition of data: Schievink, Maya, Mamelak, Carmichael. Analysis and interpretation of data: all authors. Drafting the article: Schievink. Critically revising the article: all authors. Reviewed submitted version of manuscript: all authors. Approved the final version of the manuscript on behalf of all authors: Schievink. Statistical analysis: Schievink, Nuño, Bonert.