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The Science Advances article is http://advances.sciencemag.org/content/4/10/eaat3807

"Seventeen surgeons and 13 medical students participated in this study." According to Table S1 they were classified as:

- 8 expert, mean age 35, 700 laparoscopic procedures in average

- 9 novice surgeons, mean age 31, 60 laparoscopic procedures in average

- 7 trainees and 5 controls, medical school year 1-4, 0 laparoscopic procedures.

The article has 8 authors.