Pelvic Inflammatory Disease plan identification number Payload Insertion Device parameter identification Prime Item Development Project Information Document Proportional Integral Derivation Proportional Integral Derivative Protocol Identifier Packet Identifier pain intensity difference pain intensity differences parameter identifier partial initial decision Patient Identification Photoionization Detector Planned Industrial Development Portable Identification Code process ID process identification number Process Identifier Product ID Product IDentification Product IDentifier Program Information Document Program Introduction Document Project IDentification Project Initiation Document prolapsed intervertebral disc Proportional Integral and Derivative