An optimized integrin α6‐targeted peptide for positron emission tomography/magnetic resonance imaging of pancreatic cancer and its precancerous lesion oleh Yan Mei, Ying‐He Li, Xiao‐Chun Yang, Chao Zhou, Zhi‐Jian Li, Xiao‐Bin Zheng, Jia‐Cong Ye, Cheng Li, Xuan‐Hong Zhang, Jian‐Min Yuan, Hui‐Qiang Huang, Wei Fan, Wei‐Guang Zhang, Mu‐Sheng Zeng, Guo‐Kai Feng