3258234 MPPCs multi-pixel photon counters 7 3258238 MPPCs major postoperative pulmonary complications 3 3258236 MPPCs hMSC-PCL/PLGA constructs 1 3258237 MPPCs magnetized plasma photonic crystals 1 3258239 MPPCs metalloporphyrinpeptoid conjugates 1 3258235 MPPCs multipotent progenitor cells 1