Original sentence: A report in 2009 on research done at Stanford University showed the correlation of various factors with mature milk production in mothers of preterm babies (born before the 31st week of gestation).The authors of the report have also produced a video which shows the technique and they stated that this technique is good for both mothers of premature infants as well as mothers that return to work or pump for other purposes.The research found that hand expression of milk (using a technique they call "hands on pumping", or HOP), along with several other factors, was highly correlated with higher milk production.The study also showed that the mothers who used HOP more than 5 tiems a day in the first 3 days after birth could increase their milk production 8 weeks later, and that, for these mothers, milk production increased 48% even without increased pumping.This research also showed that an improved model of breast pump with an improved suction pattern could improve milk volume over other breast pumps
Edited sentence: However, using early hand expression and combining this with massage on the breast with the pump attached was shown to increase milk volumes by 100%.New research  at Stanford University in Palo Alto, CA has shed new light on the efficiency of breast pumps.That means that a high efficiency pump leaves over half of the milk in a typical mothers breast.The research found that even the most effective breast pumps empty most other breasts at 50% or less efficiency.This research was done with an improved model of breast pump with an improved suction pattern that was shown to improve milk volume better than other breast pumps.This technique is called "Hands on Pumping" The authors of the report have also produced a video which shows the technique and they stated that this technique is good for both mothers of premature infants as well as mothers that return to work or pump for other purposes