Correction: The longitudinal association between patient empowerment and patient-reported outcomes: What is the direction of effect?

• Mariela Acuña Mora, 
• Carina Sparud-Lundin, 
• Eva Fernlund, 
• Shalan Fadl, 
• Kalliopi Kazamia, 
• Annika Rydberg, 
• Åsa Burström, 
• Katarina Hanseus, 
• Philip Moons, 
• Ewa-Lena Bratt