FARMINGTON HILLS, MICH. -- A doctor who police say has spent two decades providing medical assistance to youth hockey teams in Michigan and Minnesota faces 10 more charges of criminal sexual conduct after being accused by patients across Michigan, authorities said Wednesday.

The Farmington Hills Police Department received 33 additional tips about urologist Dr. Zvi Levran following his initial October arrest, Chief Jeff King said, and the Oakland County Prosecutor's Office authorized the 10 additional charges in those cases.

The tips came from local communities including Novi, Livonia, West Bloomfield and Redford, King said. Tips also have come from California, Georgia, North Carolina, Minnesota, Arizona and Canada.

Levran's attorney, Joe Lavigne, has entered not guilty pleas on his client's behalf.

"We're looking forward to defending the charges," he said.

Levran has been in custody since surrendering to police on Nov. 10.

The role of sports doctors and their interactions with athletes have come under scrutiny in recent years.

Former Michigan State University sports doctor Larry Nassar was sentenced in 2018 to 40 to 175 years in prison after admitting to molesting some of the nation's top gymnasts for years under the guise of medical treatment. He was accused of sexually assaulting hundreds of women and girls.

Former University of Michigan athletes, students and others have said they were molested by University of Michigan sports doctor Robert Anderson. Anderson was director of the campus health service and a physician for multiple sports teams, including football. He died in 2008 after working at the university for nearly 40 years.

Resources for sexual assault survivors in Canada

If you or someone you know is struggling with sexual assault or trauma, the following resources are available to support people in crisis:

If you are in immediate danger or fear for your safety, you should call 911.

A full list of sexual assault centres in Canada that offer information, advocacy and counselling can be found at . Resources in your community can be found by entering your postal code. 

Helplines, legal services and locations that offer sexual assault kits in Alberta, B.C., Saskatchewan, Manitoba, Quebec, Ontario and Nova Scotia can be found .

National Residential School Crisis Line: +1 866 925 4419

: 416 597 8808 

Canadian Human Trafficking Hotline: +1 833 900 1010 

Trans Lifeline: +1 877 330 6366

Sexual misconduct support for current or former members of the Armed Forces: +1 844 750 1648

Read about your rights as a victim .