Association between a low dose of proton pump inhibitors and kidney function decline in elderly hypertensive patients: a retrospective observational study oleh Tomohito Wakabayashi, Keiko Hosohata, Saki Oyama, Ayaka Inada, Iku Niinomi, Hiroko Kambara, Tatsuya Iida, Keiko Hasebe, Hiroyuki Matsuoka, Mayako Uchida, Etsuko Kumagai