http://www.scielo.br/scielo.php?pid=S0034-70942001000300001&script=sci_arttext&tlng=en
This is why you should consider adding extra oxygen into your blood before having an operation.
Bound-Oxygen – Nasal | Throat | Gut | Scalp – Sprays
All Natural – Nasal | Throat | Gut | Scalp Sprays – for Fast Relief and Prevention
http://www.scielo.br/scielo.php?pid=S0034-70942001000300001&script=sci_arttext&tlng=en
This is why you should consider adding extra oxygen into your blood before having an operation.