OPPORTUNITY HIGHLIGHTS   MercyOne North Iowa Medical Center has an excellent full time employment opportunity for a Board Certified or Board Eligible Nephrology physician to join a practice located in Mason City, Iowa.   The selected candidate will be fellowship trained in Nephrology and join a team of two Nephrologists and two Nurse Practitioners in this growing practice.   The Nephrology service at MercyOne North Iowa Medical Center has an established referral base and draws from a 14-county network of about 240,000 across northern Iowa and southern Minnesota. This opportunity is able to sponsor H-1B visa and J-1 waiver candidates.   This is an exciting opportunity the