On 2014 Sep 05, M Felix Freshwater commented:

This study has a few unanswered questions concerning the relevant variables obesity and ADM. Obesity was not defined. Was BMI recorded and some cutoff used or was there some other definition. If so, did the authors find a cutoff for BMI? The study intimates that ADM was used after 2005. No data are provided for complications as a function of time. Perhaps ADM is a proxy for this and rather than there being a protective effect from ADM, the "benefit" was in fact the learning curve that the group experienced? I hope the authors can provide answers.

On 2014 Sep 05, M Felix Freshwater commented:

This study has a few unanswered questions concerning the relevant variables obesity and ADM. Obesity was not defined. Was BMI recorded and some cutoff used or was there some other definition. If so, did the authors find a cutoff for BMI? The study intimates that ADM was used after 2005. No data are provided for complications as a function of time. Perhaps ADM is a proxy for this and rather than there being a protective effect from ADM, the "benefit" was in fact the learning curve that the group experienced? I hope the authors can provide answers.