TABLE 2.

Most active authors, their publications and H-index.

	Extracellular matrix			Hydrogels			Drug-delivery
	Pulications	H-Index		Pulications	H-Index		Pulications	H-Index
Laurencin Ct	8	7	Reis RL	7	6	Reis RL	7	5
Li X	6	5	Alsberg E	5	5	Vallet-Regi M	5	5
Reis Rl	6	5	Zhang X	5	4	Arcos D	4	4
Zhang Y	6	5	Jeon O	4	4	Chen FM	4	4
Kaplan Dl	5	5	Liu X	4	4	Kaplan DL	4	4
Wang Z	5	5	Wang H	4	4	Orive G	4	4
Zhang X	5	3	Wang X	4	4	Tabata Y	4	4
Chen Fm	4	4	Zhang Y	4	4	Wang Z	4	4
Chen X	4	2	Ameer GA	3	3	Webster TJ	4	4
Ghezzi Ce	4	4	Censi R	3	3	Baino F	3	3