Mine was two pages. I felt like one page was not enough since about half of the page was just your education and clinical experiences. I needed the extra page for my work history. It doesn't lessen your chances of being selected. I will be starting a new grad residency soon.
^^Yes, mine is two...first page is my qualifications summary, education, and BRIEF mention of clinicals. Second page is work history, organizational memberships, computer skills, and certifications (BLS). I'm a career changer, so I put relevant skills from my previous jobs in my work experience. It's two pages, but lots of white space and easy to read (so I've been told). Mileage may vary depending on one's previous work experience.