Kimberly Quaid and Dennis Quaid at World Premiere of 'Vantage Point' held at the Lowe's Lincoln Square Theatre, New York City, USA - 20.02.08

Following an investigation, the California Department Of Public Health concluded the failure of staff at Cedars-Sinai Medical Center to follow their own procedures resulted in incorrect doses of Heparin being administered to children.

The report rules the overdoses were "preventable medication errors".

The Traffic actor and his wife Kimberly's babies Thomas Boone and Zoe Grace were given almost fatal overdoses of the injectable anticoagulant in November (07) - Cedars-Sinai staff gave the babies 1,000 times the normal 10-unit dose of Heparin shortly after they were born to a surrogate mother.

The Quaid twins have since recovered from the incident.

Source: WENN