"Drip before gravity" a comment on Grant's letter on gravity flow technique.

To the Editor I read the research letter “Epidural gravity flow technique for labor analgesia” by Drs Grant GJ, Echevarria GC, Agoliati AP, et al [1][1] with a great interest. They have reconfirmed the usefulness of gravity flow technique over bolus epidural injection reported in 1997 by Cohen