Clinical and Economic Evaluation of Laparoscopically Assisted Percutaneous Endoscopic Gastrostomy Versus Open Gastrostomy in Patients for Whom Endoscopic Gastrostomy Is Difficult Akira Kameyama*, Seiiiro Yoshifuku, Kotaro Sasahara, Noriaki Otagiri, Masatake Miyamoto, Yasunori Nishida and Katsunori Tauchi