function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barranco, P. & Mayoral, J. G.', 4],
    ['Barranco, Pablo & Harvey, Mark S.', 1],
    ['Christian, Erhard', 1],
    ['Christian, Erhard & Isaia, Marco & Paschetta, Mauro', 2],
    ['Mayoral, J. G. & Barranco, P.', 5],
    ['Mayoral, Jaime & Hernández-Borroto, Samuel', 3],
    ['Souza, Maysa F. V. R. & Ferreira, Rodrigo L.', 4],
    ['Souza, Maysa F. V. R. & Mayoral, Jaime & Ferreira, Rodrigo L.', 2],
    ['Souza, Maysa Fernanda Villela Rezende & Ferreira, Rodrigo Lopes', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=28)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);