| Level I | Good quality evidence |
Systematic review of RCTs with consistent findings High quality individual RCT |
| Level II |
Limited quality patient orientated evidence |
Systematic review of lower quality studies or studies with inconsistent findings Low quality clinical trial Cohort studies Case-control studies |
| Level III | Other |
Consensus guidelines, extrapolations from bench research, usual practice, opinion, disease-oriented evidence (intermediate or physiologic outcomes only), or case series |
[39] Valganciclovir, oral: 1. Martin DF, Sierra-Madero J, Walmsley S, Wolitz RA, Macey K, Georgiou P, Robinson CA, Stempien MJ; Valganciclovir Study Group. A controlled trial of valganciclovir as induction therapy for cytomegalovirus retinitis. N Engl J Med. 2002 Apr 11;346(15):1119-26. http://www.ncbi.nlm.nih.gov/pubmed/11948271
Valganciclovir, oral:Brown F, Banken L, Saywell K, Arum I. Pharmacokinetics of valganciclovir and ganciclovir following multiple oral dosages of valganciclovir in HIV- and CMV-seropositive volunteers. Clin Pharmacokinet. 1999 Aug;37(2):167-76. http://www.ncbi.nlm.nih.gov/pubmed/10496303