Statement of Authorship

Category 1

1. 
   Conception and Design
   Martina K. Shephard, Joanna M. Zakrzewska
   
2. 
   Acquisition of Data
   Martina K. Shephard, Joanna M. Zakrzewska
   
3. 
   Analysis and Interpretation of Data
   Martina K. Shephard, E. Anne MacGregor, Joanna M. Zakrzewska
   

Category 2

1. 
   Drafting the Manuscript
   Martina K. Shephard
   
2. 
   Revising It for Intellectual Content
   Martina K. Shephard, E. Anne MacGregor, Joanna M. Zakrzewska
   

Category 3

1. 
   Final Approval of the Completed Manuscript
   Martina K. Shephard, E. Anne MacGregor, Joanna M. Zakrzewska