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de Man RA, Schalm SW, van der Heijden AJ, ten Kate FW, Wolff ED, Heijtink RA.de Man RA, et al. Among authors: heijtink ra.J Hepatol. 1989 May;8(3):367-72. doi: 10.1016/0168-8278(89)90036-6.J Hepatol. 1989.PMID: 2471723
Janssen HL, Berk L, Heijtink RA, ten Kate FJ, Schalm SW.Janssen HL, et al. Among authors: heijtink ra.Hepatology. 1993 Mar;17(3):383-8.Hepatology. 1993.PMID: 8444411Clinical Trial.