1. Gene therapy—where are we?
Dr Alan E Smith, MD 
The Lancet 
Volume 354, Pages S1-S4 (July 1999)
DOI: /S (99)
Copyright © 1999 Elsevier Ltd Terms and Conditions

2. Figure 1 In-vivo and ex-vivo approaches to gene therapy
The Lancet  , S1-S4DOI: ( /S (99) )
Copyright © 1999 Elsevier Ltd Terms and Conditions

3. Figure 2
Summary of gene-therapy protocols reviewed by the US Recombinant DNA Advisory Committee as of February, 1999, categorised by disease
From
The Lancet  , S1-S4DOI: ( /S (99) )
Copyright © 1999 Elsevier Ltd Terms and Conditions