I'm reading a paper on Wick renormalization and there are a couple of things that are not that clear to me.
The paper ends with the following sentence:
In Euclidean quantum field theory, the existence of interacting fields leads to the exponential integrability problem of $S_n(f)$ for some very special $f$ on some specific abstract Wiener space. The Wick renormalization method reduces the problem to exponential integrability problem of $I_n(f)$.
Where $S_n(f)$ is the Stratonovich integral while $I_n(f)$ is the Ito integral.
So I wanted to ask: why are we dealing with a Stratonovich integral? Moreover, why is it relevant the fact of obtaining an Ito integral from a Stratonovich one?