Dear Alfonso,

Thank you so much for your reply. 
This same reviewer is also arguing that Simult might be a better choice over RegBP. Looking at the CONN documentation, I found the link below stating that, even though Simult might offer better control, it may also lead to lower sensitivity, and Simult may be better suited in cases when the relationship between the nuisance regressors and the associated BOLD signal effects is best characterized as a non-zero-order filtering operation. Could you please point me towards a reference to back these up?
https://www.nitrc.org/forum/forum.php?fo...

Many thanks