Effectiveness of a Preventative Program for Groin Pain Syndrome in Elite Youth Soccer Players: A Prospective, Randomized, Controlled, Single-Blind Study oleh Filippo Cotellessa, Luca Puce, Matteo Formica, Maria Cesarina May, Carlo Trompetto, Marco Perrone, Andrea Bertulessi, Vittorio Anfossi, Roberto Modenesi, Lucio Marinelli, Nicola Luigi Bragazzi, Laura Mori