; or (2) preempting, limiting, or modifying a collective bargaining agreement entered into by a participating hospital. (k) Regulations (1) In general The Secretary shall promulgate such regulations as are appropriate and necessary to implement this section. (2) Implementation (A) In general Except as provided in subparagraph (B), as soon as practicable but not later than 2 years after the date of the enactment of this section, a participating hospital shall have implemented a hospital-wide staffing plan for nursing services under this section. (B) Special rule for rural hospitals In the case of a participating hospital located in a rural area (as defined in section 1886(d)(2)(D)), such participating hospital shall have implemented a hospital-wide staffing plan for nursing services under this section as soon as practicable but not later than 4 years after the date of the enactment of this section. (l) Definitions In this section: (1) Declared state of emergency The term declared state of emergency means an officially designated state of emergency that has been declared by the Federal Government or the head of the appropriate State or local governmental agency having authority to declare that the State, county, municipality, or locality is in a state of emergency, but does not include a state of emergency that results from a labor dispute in the health care industry or consistent understaffing. (2) Participating hospital The term participating hospital means a hospital (as defined in section 1861(e)) that has entered into a provider agreement under section 1866. (3) Person The term person means one or more individuals, associations, corporations, unincorporated organizations, or labor unions. (4) Registered nurse The term registered nurse means an individual who has been granted a license to practice as a registered nurse in at least one State. (5) Shift The term shift means a scheduled set of hours or duty period to be worked at a participating hospital. (6) Unit The term unit means, with respect to a hospital,