Integrative group psychotherapy reduces daily cortisol output and hair cortisol: A randomized active‑controlled trial with multi‑day profiling - Evgeny Pokushalov; Evgeny Terebenin; Andrey Ponomarenko; Yulia Sinyuk; Alexander Samoilov; Tatiana Gigovskaya; Marina Bubnovskaya; Dmitry Kudlay; Elena Trubicina; Claire Garcia; Richard Miller (PLoS ONE, 2026)