function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Coesel, Peter & Westen, Marien Van', 2],
    ['Costa, Fabiana De Matos & Ramos, Geraldo José Peixoto', 4],
    ['Levanets, Anatoliy & Janse van Vuuren, Sanet', 8],
    ['Ramos, G. J. P. & Santos, M. A. & Moura, C. W. N.', 2],
    ['Ramos, Geraldo José Peixoto & Oliveira, Ivania Batista De', 2],
    ['Ramos, Geraldo José Peixoto & Santos, Maria Aparecida Dos', 8],
    ['Santos, Maria Aparecida Dos & Ramos, Geraldo José Peixoto', 7],
    ['Van Westen, Marien C. & Coesel, Peter F. M.', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=40)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);