Clinical toxicology study of an herbal medicinal extract of paullinia cupana, trichilia catigua, ptychopetalum olacoides and zingiber officinale (Catuama®) in healthy volunteers - Oliveira, Celso H.; Moraes, Maria Elizabete A.; Moraes, Manoel O.; Bezerra, Fernando A. F.; Abib, Eduardo; De Nucci, Gilberto (Phytotherapy Researh, 2005)