Proof-of-Mechanism Study of the Phosphodiesterase 10 Inhibitor RG7203 in Patients With Schizophrenia and Negative Symptoms oleh Daniel Umbricht, Markus Abt, Paul Tamburri, Christopher Chatham, Štefan Holiga, Michael J. Frank, Anne G.E. Collins, David P. Walling, Rick Mofsen, Daniel Gruener, Lev Gertsik, Jeff Sevigny, Sanjay Keswani, Juergen Dukart