Solitary Peutz-Jeghers type hamartomatous polyps in the duodenum are not always associated with a low risk of cancer: two case reports by Koide Tomoko, Takahashi Hirokazu, Sakamoto Yasunari, Iida Hiroshi, Tanaka Michio, Tsunemi Akisa, Saito Kumiko, Fujisawa Nobutaka, Takahata Ayako, Akimoto Keiko, Tsuzawa Kaoru, Suzuki Kaori, Hirai Mitsuru, Inamori Masahiko, Sekino Yusuke, Tokoro Chikako, Abe Yasunobu, Nakajima Atsushi, Maeda Shin, Koyama Shigeru

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