1. 
   PGF
   PGF: Placental growth factor.
   Found op http://www.medterms.com/script/main/art.html?articlekey=26447
   
   
2. 
   Pgf
   Picture of the Outremont parc in the summer ...
   Found op http://en.wikipedia.org/wiki/Pgf
   
   
3. 
   pgf
   1) Placental growth factor
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/pgf/1
   
   

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