1. Universidad del Valle de México, Hermosillo, SON, Mexico
2. Christus Spohn Hospital, Memorial, Corpus Christi, TX, USA
3. Christus Spohn Hospital Residency Program, Corpus Christi, TX, USA
4. Critical Care Services, Foundation Surgical Hospital, Houston, TX, USA
5. The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
6. Texas A&M University, Corpus Christi, TX 78413, USA