The Journal of Public Health.
The distressed boys - who were six years old on average - were forcibly held down during the procedure that was carried under a local anaesthetic which is only considered suitable for newborns and infants.
The study's co-authors, who found that 45% of the boys ended up with complications, concluded that "this incident highlights the harm associated with circumcision in young children by unregulated operators" The Guardian newspaper reports.
An earlier report by the BBC found the Royal London hospital treated 32 boys suffering from circumcision complications over the course of one Summer.
One Muslim parent told BBC London that his sons, aged 5 and 10, were left in agony after being circumcised by a "community practitioner". The boys were held down by six people as they were circumcised without an anaesthetic and the five year was kept isolated in hospital for 10 days while he recovered.
For a fuller report click here for the BBC website.