function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barrio-Amorós, César L. & Brewer-Carías, Charles', 3],
    ['Bell, C. J. & Evans, S. E. & Maisano, J. A.', 1],
    ['Diago-Toro, María F. & García-Cobos, Daniela', 1],
    ['Doan, Tiffany M. & Castoe, Todd A.', 2],
    ['Kok, Philippe J. R. & Bittenbinder, Mátyás A.', 2],
    ['Myers, C. W. & Donnelly, M. A.', 1],
    ['Ribeiro-Júnior, Marco A. & Amaral, Silvana', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);