Found the following HTML validation problems:
Cohort.html:1251:1 (Cohort.Rd:773): Warning: missing </ul> before </div>
Cohort.html:216:1 (Cohort.Rd:97): Warning: <h5> anchor "Usage" already defined
Cohort.html:222:1 (Cohort.Rd:101): Warning: <h5> anchor "Arguments" already defined
Cohort.html:245:1 (Cohort.Rd:114): Warning: <h5> anchor "Usage" already defined
Cohort.html:257:1 (Cohort.Rd:124): Warning: <h5> anchor "Arguments" already defined
Cohort.html:289:1 (Cohort.Rd:146): Warning: <h5> anchor "Usage" already defined
Cohort.html:305:1 (Cohort.Rd:156): Warning: <h5> anchor "Usage" already defined
Cohort.html:315:1 (Cohort.Rd:164): Warning: <h5> anchor "Arguments" already defined
Cohort.html:343:1 (Cohort.Rd:182): Warning: <h5> anchor "Usage" already defined
Cohort.html:349:1 (Cohort.Rd:186): Warning: <h5> anchor "Arguments" already defined
Cohort.html:377:1 (Cohort.Rd:204): Warning: <h5> anchor "Usage" already defined
Cohort.html:387:1 (Cohort.Rd:212): Warning: <h5> anchor "Arguments" already defined
Cohort.html:415:1 (Cohort.Rd:230): Warning: <h5> anchor "Usage" already defined
Cohort.html:421:1 (Cohort.Rd:234): Warning: <h5> anchor "Arguments" already defined
Cohort.html:449:1 (Cohort.Rd:252): Warning: <h5> anchor "Usage" already defined
Cohort.html:455:1 (Cohort.Rd:256): Warning: <h5> anchor "Arguments" already defined
Cohort.html:482:1 (Cohort.Rd:273): Warning: <h5> anchor "Usage" already defined
Cohort.html:488:1 (Cohort.Rd:277): Warning: <h5> anchor "Arguments" already defined
Cohort.html:519:1 (Cohort.Rd:298): Warning: <h5> anchor "Usage" already defined
Cohort.html:525:1 (Cohort.Rd:302): Warning: <h5> anchor "Arguments" already defined
Cohort.html:552:1 (Cohort.Rd:319): Warning: <h5> anchor "Usage" already defined
Cohort.html:558:1 (Cohort.Rd:323): Warning: <h5> anchor "Arguments" already defined
Cohort.html:583:1 (Cohort.Rd:338): Warning: <h5> anchor "Usage" already defined
Cohort.html:599:1 (Cohort.Rd:348): Warning: <h5> anchor "Usage" already defined
Cohort.html:605:1 (Cohort.Rd:352): Warning: <h5> anchor "Arguments" already defined
Cohort.html:631:1 (Cohort.Rd:369): Warning: <h5> anchor "Usage" already defined
Cohort.html:644:1 (Cohort.Rd:380): Warning: <h5> anchor "Arguments" already defined
Cohort.html:675:1 (Cohort.Rd:401): Warning: <h5> anchor "Usage" already defined
Cohort.html:681:1 (Cohort.Rd:405): Warning: <h5> anchor "Arguments" already defined
Cohort.html:708:1 (Cohort.Rd:422): Warning: <h5> anchor "Usage" already defined
Cohort.html:714:1 (Cohort.Rd:426): Warning: <h5> anchor "Arguments" already defined
Cohort.html:743:1 (Cohort.Rd:445): Warning: <h5> anchor "Usage" already defined
Cohort.html:749:1 (Cohort.Rd:449): Warning: <h5> anchor "Arguments" already defined
Cohort.html:774:1 (Cohort.Rd:464): Warning: <h5> anchor "Usage" already defined
Cohort.html:780:1 (Cohort.Rd:468): Warning: <h5> anchor "Arguments" already defined
Cohort.html:811:1 (Cohort.Rd:489): Warning: <h5> anchor "Usage" already defined
Cohort.html:822:1 (Cohort.Rd:498): Warning: <h5> anchor "Arguments" already defined
Cohort.html:853:1 (Cohort.Rd:519): Warning: <h5> anchor "Usage" already defined
Cohort.html:866:1 (Cohort.Rd:530): Warning: <h5> anchor "Arguments" already defined
Cohort.html:904:1 (Cohort.Rd:558): Warning: <h5> anchor "Usage" already defined
Cohort.html:913:1 (Cohort.Rd:565): Warning: <h5> anchor "Arguments" already defined
Cohort.html:939:1 (Cohort.Rd:581): Warning: <h5> anchor "Usage" already defined
Cohort.html:948:1 (Cohort.Rd:588): Warning: <h5> anchor "Arguments" already defined
Cohort.html:975:1 (Cohort.Rd:605): Warning: <h5> anchor "Usage" already defined
Cohort.html:981:1 (Cohort.Rd:609): Warning: <h5> anchor "Arguments" already defined
Cohort.html:1004:1 (Cohort.Rd:622): Warning: <h5> anchor "Usage" already defined
Cohort.html:1020:1 (Cohort.Rd:632): Warning: <h5> anchor "Usage" already defined
Cohort.html:1026:1 (Cohort.Rd:636): Warning: <h5> anchor "Arguments" already defined
Cohort.html:1049:1 (Cohort.Rd:649): Warning: <h5> anchor "Usage" already defined
Cohort.html:1055:1 (Cohort.Rd:653): Warning: <h5> anchor "Arguments" already defined
Cohort.html:1084:1 (Cohort.Rd:672): Warning: <h5> anchor "Usage" already defined
Cohort.html:1090:1 (Cohort.Rd:676): Warning: <h5> anchor "Arguments" already defined
Cohort.html:1119:1 (Cohort.Rd:695): Warning: <h5> anchor "Usage" already defined
Cohort.html:1125:1 (Cohort.Rd:699): Warning: <h5> anchor "Arguments" already defined
Cohort.html:1154:1 (Cohort.Rd:718): Warning: <h5> anchor "Usage" already defined
Cohort.html:1160:1 (Cohort.Rd:722): Warning: <h5> anchor "Arguments" already defined
Cohort.html:1183:1 (Cohort.Rd:735): Warning: <h5> anchor "Usage" already defined
Cohort.html:1199:1 (Cohort.Rd:745): Warning: <h5> anchor "Usage" already defined
Cohort.html:1205:1 (Cohort.Rd:749): Warning: <h5> anchor "Arguments" already defined
Cohort.html:1228:1 (Cohort.Rd:762): Warning: <h5> anchor "Usage" already defined
Cohort.html:1234:1 (Cohort.Rd:766): Warning: <h5> anchor "Arguments" already defined
Source.html:389:1 (Source.Rd:228): Warning: missing </ul> before </div>
Source.html:167:1 (Source.Rd:96): Warning: <h5> anchor "Usage" already defined
Source.html:173:1 (Source.Rd:100): Warning: <h5> anchor "Arguments" already defined
Source.html:196:1 (Source.Rd:113): Warning: <h5> anchor "Usage" already defined
Source.html:212:1 (Source.Rd:123): Warning: <h5> anchor "Usage" already defined
Source.html:218:1 (Source.Rd:127): Warning: <h5> anchor "Arguments" already defined
Source.html:241:1 (Source.Rd:140): Warning: <h5> anchor "Usage" already defined
Source.html:247:1 (Source.Rd:144): Warning: <h5> anchor "Arguments" already defined
Source.html:270:1 (Source.Rd:157): Warning: <h5> anchor "Usage" already defined
Source.html:276:1 (Source.Rd:161): Warning: <h5> anchor "Arguments" already defined
Source.html:302:1 (Source.Rd:177): Warning: <h5> anchor "Usage" already defined
Source.html:308:1 (Source.Rd:181): Warning: <h5> anchor "Arguments" already defined
Source.html:333:1 (Source.Rd:196): Warning: <h5> anchor "Usage" already defined
Source.html:339:1 (Source.Rd:200): Warning: <h5> anchor "Arguments" already defined
Source.html:366:1 (Source.Rd:217): Warning: <h5> anchor "Usage" already defined
Source.html:372:1 (Source.Rd:221): Warning: <h5> anchor "Arguments" already defined
dot-print_filter.html:50:1 (dot-print_filter.Rd:12): Warning: missing </ul> before </div>