Protocol for the RETHINK study: a randomised, double-blind, parallel-group, non-inferiority clinical trial comparing acetaminophen and NSAIDs for treatment of chronic pain in elder... by Tempei Miyaji, Mototsugu Shimokawa, Hiroyuki Aono, Sadamoto Zenda, Makoto Endo, Yasuharu Nakashima, TOSHIHIKO HARA, Shinya Kawahara, Taishi Sato, Masami Tokunaga, Taro Mawatari, Tsutomu Kawano, Sanae Sakamoto, Toshio Takano, Masumi Miyake

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