Viagra soft on sales.
Jones
J S
JS
D003132:Commerce / Q000639:trends*; D007172:Erectile Dysfunction / Q000188:drug therapy; D006801:Humans; D008297:Male; D010726:Phosphodiesterase Inhibitors / Q000191:economics* / Q000627:therapeutic use; D010879:Piperazines / Q000191:economics* / Q000627:therapeutic use; D011687:Purines; D000068677:Sildenafil Citrate; D013019:South Africa; D013450:Sulfones
D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate