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PDA | Definition, Meaning, History, & Facts | Britannica
Personal digital assistant - Wikipedia
Patent ductus arteriosus (PDA) - Symptoms and causes
What is a personal digital assistant (PDA)? - TechTarget
PDA Definition & Meaning - Merriam-Webster
How PDAs Work | HowStuffWorks
PDA | definition in the Cambridge English Dictionary
Palm (PDA) - Wikipedia
The Golden Age of PDAs | PCMag
Parenteral Drug Association | Pharmaceutical Regulatory News | PDA