Error message

Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /var/www/html/default/includes/common.inc).
Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in menu_set_active_trail() (line 2405 of /var/www/html/default/includes/menu.inc).

Rigid microenvironments promote cardiac differentiation of mouse and human embryonic stem cells

Arshi, A. et al. Rigid microenvironments promote cardiac differentiation of mouse and human embryonic stem cells. Science and technology of advanced materials 14, 025003 (2013).