Information is available here (in Italian)

Doctors who join Specialisation Schools benefit from a specialist training contract, as regulated by Legislative Decree 368/99 and subsequent amendments. Each year, the MUR publishes a call for applications specifying the number of specialist training contracts to be activated and the starting date of the contract. Universities may activate additional contracts for the same amount and duration with funds from donations or funding from public or private bodies.

The training contract is aimed at the acquisition of professional skills through the frequency of formal educational activities planned by the School Council, and the conduction of assistance activities, functional to the progressive acquisition of the competences envisaged by the teaching regulations of the individual schools. The total working hours are equal to those foreseen for the doctors of the national health service (a total of 38 hours per week). Are allowed 30 days of absences for personal reasons, and it's recognized the right to maternity. The sums received through the contract are Irpef exempt and non-taxable Irap, therefore it is not necessary to present the tax return for the sums received; the payment of the contributions to the INPS Separate Management is envisaged.
The contract consists of € 25,000 gross the first two years and € 26,000 gross in subsequent years.

You can find a sample contract on the "Links" section.