The Mishnah at the top of Ber. 28b says that ר' נחוניה בן הקנה used to say a short prayer before learning that he not cause harm in his learning, and afterwards to give thanks for the opportunity to learn. R' Dovid Grossman explains that according to Rambam this is required, and according to others it's not.
Today, who follows the Rambam and says these prayers as a matter of Halachah, or at least principle (ie., not just occasionally, but before and after they learn every day)?
I'm looking for documented rulings affirming the Rambam, as well as observed accounts.
This question is part of the Daf Yomi Challenge.