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ALBANY, N.Y. -- There are renewed calls for an independent health impact study on hydrofracking.

A group of independent doctors lobbied the governor and state health commissioner Thursday. They say the DEC is not the authority on a purely medical review of health impacts.

Two weeks ago, the DEC asked the health commissioner to review its study on health effects. Some doctors say this is a good step, but doesn't go far enough.

"I wouldn't say that the health department can't be trusted. I would say we haven't seen them doing the types of studies we need to see to be reassured that the full range of health impacts have been looked at. So they haven't done it yet and so we're trying to give them guidance on how to do it well," said Dr. Kathleen Nolan.

Governor Cuomo says the state continues its investigation into the hydrofracking and that conducting an independent private study could be biased.